I made these for our guild table this last meeting and they sold fast. took about 10 minutes or less to make. One bath towel will make three. I made the spa pattern.
http://tipnut.com/bath-towel-head-wrap/
Also I made two of these and they sold as soon as they were set on the table. I plan on making more. I got the link from this board for the free pattern but now they aren't free.
http://www.quiltinggems.com/patterns/pin-keepers-703