This is an excellent idea. There is a chance that the hud colors are hard coded in the game files, meaning that particular code would be extremely difficult to nearly impossible to change. HOWEVER, I do have this code for you if it'll help at all:
Individual Stock Icons (info.pac) V2.4 ASV [ds22, wiiztec]
C20E2168 0000002C
818100E8 3D609018
896BF37F 2C0B0002
4082007C 392000A5
3D408058 614A8000
897F0002 1D6B00A0
7D4A5A14 896A009E
80BF0020 2C050006
41810020 2C050000
40820030 3CA08128
60A5AE64 80A50000
2C050006 4081001C
7D8A58AE 2C0C00CC
4082000C 39600003
48000008 396B0003
7D8A58AE 2C0C00CC
40820014 2C0B0000
4182000C 39600000
4BFFFFE8 3FA08045
38C0003D 3BBD56D8
38E00000 7CC903A6
88DD0002 7C0C3000
4182001C 88DD0003
7C0C3000 41820010
3BBD0010 38E70001
4200FFE0 2C07003D
4082000C 3FA08045
3BBD56D8 899D0000
2C0C0042 40A20008
39800025 88C100ED
2C0900A5 4082002C
7CCA582E 54C6801E
54C6463E 396B0003
996A009E 2C1B0004
40820010 892A009C
39290003 992A009E
1D8C000A 7D8C3214
38EC0001 2C1B0000
4082000C 7C882378
7FFCFB78 3D8080C2
A18C4314 3BA05F65
7C0CE800 4182000C
6D1E8000 48000008
6CFE8000 83BC008C
60000000 00000000
040E215C 60000000
040E2160 60000000
C203D8B4 00000005
2C09000B 40820018
3C600006 38631C00
3C800002 38847180
7C641A14 881B001C
60000000 00000000
044218EC 00095F00
0442190C 00180000
04494990 00095F00
044949EC 80C23A60
044949F0 00180000