R/W/B, black,/white/red, cameo, nature fabrics, panels and sports fabrics are popular with teen boys. you can use a nature/hunting fishing fabriclike a panel, too. Just add borders.
Marshall Dry Good has a sports cheater fabric, 90 " wide. I bought some about 2 weeks ago for $ 5.99 a yard.great price and the fabric is nice.
Have fun and thank you for your kindness.