The Sophie's Universe afghan from Look At What I Made immediately comes to mind. I've seen a few people online make it in one solid color and it still turns out beautifully.
[lookatwhatimade.net]
Also, have you tried searching Ravelry? I bet you could find something there.

Sorry, I knit but have been thinking of learning how to crochet too.

I've had dreams of doing a raised pattern that forms a picture. Ive only found one pattern online for that sort of thing and can't find it anymore. I wanted to do a rose but don't think I could create the pattern effectively myself. My second choice would be a lattice pattern. I'm thinking my next project will be that.