Looks great! I've made quite a few t-shirt quilts -- they seem to be the "thing" for graduations now days. I recently made one for myself with shirts I collected while on vacation in Australia, and had great fun trying out new stitches on them. I try to avoid quilting over the wording or logos - I love the way they "puff out" a little after they're washed, and it really helps the t-shirts stand out. My go-to stitching is meandering on quilts for others, but here's a few I did on mine:
[ATTACH=CONFIG]420170[/ATTACH] [ATTACH=CONFIG]420171[/ATTACH] [ATTACH=CONFIG]420172[/ATTACH] [ATTACH=CONFIG]420173[/ATTACH] [ATTACH=CONFIG]420179[/ATTACH]
I did a t-shirt quilt tutorial for beginners on our blog a couple of months back, but apparently I'm not allowed to post a link to it here. It might have given you some helpful tips. Sorry!