I've made at least 10 t-shirt quilts and love doing them. Ditto what quiltingshorttimer said. Definitely avoid the plastic-y logos. You'll have a mess on your hands. And by "plastic-y", I mean if the logo is rubbery or raised, avoid it at all costs when quilting. Did it once, and never, EVER again. Also, make sure they wash the t-shirts WITHOUT fabric softeners or dryer sheets. Those can also prevent the interfacing from sticking. I know cotton thread is "traditional", but poly thread will last many, many more years than cotton.