cl_avatar_convert_rgb
cl_avatar_convert_rgb is a console command available in all 
Source games.
cl_avatar_convert_rgb is a console command that create RGB files from 64 x 64 PNG images. It requires sv_cheats 1 to work.
Save 64 x 64 size PNG picture into game ...<MOD>/avatars/ folder. Launch game with console enabled, in mainmenu, turn sv_cheats 1 and use command cl_avatar_convert_rgb
Game will create RGB files from all valid PNG files inside ...<MOD>/avatars/ folder.
Console also spew output message:
Converted rgb 'avatars/default.png'->'avatars/default.rgb'.
Note:Works (only in 
) ?