For starter's I'd look at the Moda Bakeshop site for charm pack designs:
http://www.modabakeshop.com/search/label/Charm%20Pack
also I love the "Nickle Quilt" books by Pat Speth. Check on Amazon or your library. I think my favorite is "More Nickle Quilts"
http://www.amazon.com/More-Nickel-Qu...=nickel+quilts