love I Spy quilts and have made and have made perhaps 7. My all time favorite is this one:
http://www.happyquiltingmelissa.com/...-festival.html
I have pictures posted in the I Spy search site. Disappearing 4 patches are fun and I have also done two with a wonky square within a square. google I Spy quilts images and you will be inspired by all the various ways to create this fun quilt. Get started collecting those novelty prints. There is often a swap on the board, plus I was able to obtain squares for sale on the board as well.