Do you have access to a sewing machine? A pillowcase made out of Alpha Gam-themed fabric is easy and unique. It's just straight seams.
http://4h.wsu.edu/clothing/pillowcase.htm
This gives you the proportions.
Your LQS (Local Quilt Shop) or fabric store should have rose-print fabric, or maybe squirrel-print fabric, and certainly lots of choices in red-buff-green. The fabric will cost less than $15--a lot less if you hit a sale.
(Guess what I'm going to give my Secret Squirrel?)