I keep meaning to show you this lovely, lovely book (and then promptly forget about it again!) My sister gave it to me when we saw each other in Denmark. Just looking at the cover, it's got my name written ALL over it; crochet + happy colours! My sister, being my sister, knows this!
See? Happy colours! And lots and lots of different non-square crochet motifs. I have not yet sat down and tried some of the motifs... but I will! There are lots of intriguing ones in the book.
One thing I really like, is pages with drawings of ideas for using the motifs. Aren't they fun?
If you do a lot of crochet, and want to try something other than the granny square or the odd hexagon, this is a pretty good place to start!