Try to create bigger and darker bullet icons for representing columns and its neighbours in ListColumns. The column icon is also used in the usermanager btw. I don't think they're too pretty now but they'll do their job better than before. Please shout if you find prettier icons.

source/main.dfm

@@ -1474,45 +1474,44 @@ object MainForm: TMainForm
       item
         PngImage.Data = {
           89504E470D0A1A0A0000000D49484452000000100000001008060000001FF3FF
-          610000001974455874536F6674776172650041646F626520496D616765526561
-          647971C9653C000000CF4944415478DA63FCFFFF3F03258071D400EC06302E65
-          900252690CFFFE8432FCFDC5C0F0E7C76A86DFDF66FDCF947946AC010DF57AFF
-          EA2D05FE31FCF8F39FE1CCEB6F0C2DC79E37FE2FD06820CE8045BFAE6E7760D2
-          3AF6EC2FC3875F7F19940518180A765CBDF6BFCC549B3803E67DBCBAC28E43EB
-          38D080EFFFFE33C8F3FD67A8DE7AE2DAFF5A17220D98FEACA1DA88B35E84839D
-          E1EBEF7F0C9FBF7E64E8DCBAA7F17F573C915E98744B8AE1D7D73486DF5F4219
-          7E7E6660F8FC6C35C3D797B3FECFA8262E10298EC611660000096786E12F42E4
-          E00000000049454E44AE426082}
+          610000001874455874536F667477617265005061696E742E4E45542076332E31
+          3072B22592000000D04944415478DA6364A01030D2D40069DB2A96A787DBFE90
+          650050332790EA03E2634043169364004CF367592D77F60F2F3FB37D7EDB83CB
+          10465C9A3F299B787D96D39163FAFEF9A7F095FD37D9BEBCC36A082356CDEA56
+          5E9F150CE518FEFE6260F8F39381E9DBC79FC2D70E010D798F61082386662D07
+          AFCFCAE672208D0C7F7E30C068A66F1F7E0ADF387E93EDEB071443900D28FA21
+          A698F4D62E519BE1F77788C6DF3F20864069D64FAF3E8B5C3F7683E9DFBF44A0
+          2157A9EB028AC3802AB1409574409594886408F979815800000BCAB51102FAB3
+          960000000049454E44AE426082}
         Name = 'PngImage23'
         Background = clWindow
       end
       item
         PngImage.Data = {
           89504E470D0A1A0A0000000D49484452000000100000001008060000001FF3FF
-          610000001974455874536F6674776172650041646F626520496D616765526561
-          647971C9653C000000D24944415478DA63FCFFFF3F03258071D400EC0638ECB2
-          92025269FFFFFE0F65F8F39FE1DFAF7FABFFFFFC37EB48D49967C41AD0102D1B
-          5BAFCEA3C5F0F3EF4F865B6F6F302CBE30BFF144F2F906A20CB0DF6679B551A7
-          5DEBEAC7AB0C5F7E7D6690E6906298BCBFE7DAC99C4BDA441960B7C1FC6AB96E
-          ADD6B50FD7187EFDFBC920C126CE307DE7C46B67CAAE126780F572938628D5D8
-          7A3E4E01861F7F7E307CFDF89961FE96998D17BB6E13E705CB798652C0404BFB
-          FBFD6F281033FC7EFB6BF5DFF7BF675D9BFF88B840A4381A47980100367A8DE1
-          30EA18B50000000049454E44AE426082}
+          610000001874455874536F667477617265005061696E742E4E45542076332E31
+          3072B22592000000DC4944415478DA6364A01030D2D6803A3E5686A64FBFC933
+          A08E8F0B484E01E2234043E691660054B3909880DBB72FDFBEFDF8F6AB039721
+          8CB8348BCA897A8A48084BFCFAF6EBF7D3BB4F1EFCF88EDD10466C9A2554C53D
+          C5644525FEFEFCC7F0EFE75F869F5F7FFE7E7AFFD9839F3F300D6144D72CA525
+          E929A12221F1EFC75F863F400CA68186FCFAF2F3F7F327CF1FFCFCF91BC51064
+          03CAF9C47852355C3495FF7EFFCBF0F7C71F0608FD0F4803D94083BE7FFEFEED
+          D9F317F7FEFFFF1F0534E432955D407118502516A8920ED00C61202B25220CA1
+          202F100900A0BDC31179096B110000000049454E44AE426082}
         Name = 'PngImage24'
         Background = clWindow
       end
       item
         PngImage.Data = {
           89504E470D0A1A0A0000000D49484452000000100000001008060000001FF3FF
-          610000001974455874536F6674776172650041646F626520496D616765526561
-          647971C9653C000000D14944415478DA63FCFFFF3F03258071D4001C06B0314A
-          01C9B43FFF19427F01A57FFC6758FDED1FC32C99FFFF9F116B40C3BFEAFAFA7F
-          D6960CFF7FFE60F876E20CC3F396D6468DFFFF1A8832E0172BE355A6EDDBB5FE
-          9E3AC6F0F7DD070606056586ABB9C5D74CFFFFD126CA808FCC8C573956AED0FA
-          7BFA38C3FFAFDF19FECBC8339CA86CBCE6F2FF2771063C63666CE0ACACAE6717
-          1761F8F7F52BC3C70F5F18F6744E6E8CFFFF85382FDC626496FA0A0CC42F0CCC
-          A19F1918199E31B0AE7EC9C032ABFAFF07220391E2681C59060000ED3B81E139
-          F4E1A40000000049454E44AE426082}
+          610000001874455874536F667477617265005061696E742E4E45542076332E31
+          3072B22592000000B64944415478DA6364A01030D2D4803A0606962606863F64
+          1900D4CC09A4FA80F818D090C5241900D3ACC5C0E0FE9281E1F35B06861E5C86
+          30E2D26CC2C0E0A5C3C020F79981E1E77E06869BEF7018C2884DB32550B32150
+          F36F20E727107F0252078186BCC7620823BA667BA0665324CD3F910C390234E4
+          039A21C8061429303024C5313068FF00F27F2169FE01A55F03C30368C88D7F0C
+          0C894043AE52D7051487015562812AE900DD10067252229221E4E70562010091
+          D36011DDA2E8350000000049454E44AE426082}
         Name = 'PngImage26'
         Background = clWindow
       end
@@ -1992,13 +1991,16 @@ object MainForm: TMainForm
       end
       item
         PngImage.Data = {
-          89504E470D0A1A0A0000000D4948445200000010000000100804000000B5FA37
-          EA0000000467414D410000AFC837058AE90000001974455874536F6674776172
-          650041646F626520496D616765526561647971C9653C000000724944415478DA
-          63FCCF801F300E2E05CFA418D21842FF33FC5FFD7F96EC336C0A1A78EB5981F4
-          2F860F8D720DD8145C15D2FACDF08F818DE1D535796D2C0A9E5E15D6FAC9F09F
-          819DE1E535056C0A9E00AD60032AF8C5F0B651199B158FA4FEA7FD073AF2EFEA
-          7FB3D4B03972308424760000BB4A370114DE4B940000000049454E44AE426082}
+          89504E470D0A1A0A0000000D49484452000000100000001008060000001FF3FF
+          610000001874455874536F667477617265005061696E742E4E45542076332E31
+          3072B22592000000CE4944415478DA6364A01030D2D480B8B838D6458B16FD26
+          CB00A0662E203505888F000D9947920130CD8A8A8A6E6FDFBEFDF6E9D3A70E5C
+          8630E2D2ACA3A3E3A9ACAC2CF1F1E3C7DFE7CE9D7B80CB10466C9A4D4D4D3DB5
+          B4B424BE7FFFCEF0EDDB37860F1F3EFCBE70E1C2832F5FBE6018C288AED9D6D6
+          D6D3D8D85802A4F1EBD7AF700C32E4EAD5AB0F80E22886201B50AEA0A0909A90
+          90A00CB409ACE9F3E7CF601780F820FCEEDDBB6F376FDEBCF7FFFFFF28A02197
+          A9EB028AC3802AB1409574409594886408F97981580000C8CCD011BD717B9300
+          00000049454E44AE426082}
         Name = 'PngImage42'
         Background = clWindow
       end