Did you try Google? There are some that come up. This one is cute. You could also get a coloring book and use that for applique.
http://www.ebay.com/itm/Kids-Quilts-...item231efcc305
On Quiltshops.com a search for "monsters" comes up with 10 pages of links. Also, Bug Fabrics has some cute monster fabric. Here's a link:
http://www.bugfabric.com/monsters.htm