With the exception of the logo on the Tshirt (which you could incorporate into the backing) You could do a floating blocks quilt. If you really wanted to get into the theme, you could use a light & dark purple for the background. It's a very quick quilt to make and the consistent sashing ties all the different fabrics together.
http://www.dickwightman.com/bulletin...adowquilt.html
I would stabilize all the questionable fabrics & toss them in the wash to see how they do. If something doesn't make it thru a gentle cycle, you can show your MIL and explain why that garment was not used.