[otrs] Any "color safe" themes?

Hi, Some of our agents work remotely via Terminal Services, which reduces colors to 8 bits. (This is an RDP v4 server - we can't turn up the color depth.) The color dithering of OTRS's grays and reds, etc. take forever to render in this environment... page rendering is horribly slow. I'm about to design a (probably horrifically ugly) theme with colors that will render directly, without dithering. I thought I'd ask - has anyone else already done this? Or have any insights into colors that will render correctly? Thanks, MikeM