One thing to try is to lay your colour in one layer, but have it slightly translucent, and then lay textures in the layer below, so they shine through a little bit. That way the colours don't look so flat. Gradients work quite well, too. Cool blog!
Thanks. I'll try more colour layers, I've tried adding textures but it just seems to make everything look a bit fake and wierd.
Fisherman A tale of Fishing & Videogames Black & White, 16 Pages.