I feel your pain with the yellow window. I've made games with coloured blocks/characters/platform tiles etc all assigned to different colours, and yellow is consistently the biggest pain in the ass. Red, blue, green, purple, grey, orange all allow for highlights and decent shadows with some hue-shifting, but yellow either demands a dramatic lowering of brightness and some hue-shift to add orange, or the highlight is indecipherable from the base colour, or the lowered-brightness yellow looks sickly. Yellow is the pickiest colour and the rest of your picture is a spot-on replication of the old Windows logo.

Great stuff.

Don't tell my Mac, but I have a secret love for old Pc's

Colors = awesome

I dunno what's with the anti windows hype and all :D I've been working with it since I was 10 yrs old and no problem. I'm not saying it's great, but it certainly isn't as shitty as people make it look.