My niece recently asked for a wolf quilt also! After some Googling for "wolf quilt," I was inspired by this beauty:
http://www.ddcountryquilts.com/quilts/wolf_calls.htm made by D&D Country Quilts. It's gorgeous. I found the same panel and plan to use similar log cabin blocks in greys, blues, purples, etc. I think the D&D quilt is queen size but I need to figure how to downsize to a twin.
I like your fabric selections but I would use black instead of the dark brown and gray instead of the green.
Try searching for "wolf quilts" and see if you find some inspiration like I did.
Anita
Anita