I love kid fabric! I'm quilting one right now that has these most adorable cutie pie cows on it!
It just makes me smile! I do buy a fair amount of 'fun' prints.
But I think what I buy the most of is geometric blenders. I don't do a lot with florals. Occasionally I buy a floral for a special quilt. I also buy fabrics that work for boys and men like airplane schematics, graph paper, etc..