just went to google,
they showed a lot of quilts yellow and black with the zig zag in black like the CB shirt. some of them were more themed, Christmas or Halloween. maybe you can download a CB pic and print it out on fabric to put in the ctr of a star block, something like that maybe?? Good luck with this one. Please, show us what you end up doing. you could draw a big maybe 2 feet tall Charlie Brown and applique him to the top of the quilt, or do all the characters, appliqued on.