There are a lot of I Spy type quilts pictured here - if you use the Search feature - quite a few of them should come up.
Also, Ami Simms has quilts that she calls "picture play quilts" and this site has photos of some that were made from the patterns in her book. You might get some ideas from looking at them.
http://www.amisimms.com/yourpicplayq.html
Hope you find something that will work for you;;
Wildyard has made several - the first one she made was from various sized pieces - it turned out great!
http://www.quiltingboard.com/t-70022-1.htm