How big is the print? That would determine the pattern for me. You want the pieces to be big enough to show off the pattern of the fabrics. I would think the fabrics should be "male" stuff. Men don't outgrow cars, space and sports (and more things that I can't think of at this moment). When you find the fabric, then find the pattern that will show off the prints.
I might do a search for car quilts or space quilts and see what strikes your fancy. You might enlist the child to help you look.
bkay