I'm impressed, great job!!!! I did something like this with some shirts that belonged to a good friend of mine's dad, when he passed away, made a lap quilt for each of his kidsand his wife with them.
Ohmigosh!!! What a fantastic idea! I've got tons of racing t-shirts - this would be a perfect thing to do with them!! (I don't have a sewing machine, though, so never mind.