I've noticed in themes that some images are 24 bit and other are 8 bit colors. How can I mix these? Have you noticed any speed improvements when using less colors?

Just use 24 bit for coloured images and 8 bit for black and white images.

hi jonte! when are you gonna post previews of your work? have fun theming!

I've been working with my themes for days now (I'm still a beginner) but I want to create some really nice icons that goes along with my theme and I'm really picky when I'm doing it... I'll post them later when I'm satisfied

you would want the highest available