Wow, that's a tough one. You don't want to seem ungrateful but at the same time, buying patterns and fabric for someone is very personal. It's like buying someone underwear!
I would use the excuse that you are very new to this hobby so projects take a long time (in case they ask "where's the quilt?") If your friends don't sew they may have no idea how long a quilt takes to complete.
In the meantime, use the fabrics to build your stash. You never know when some of those goofy fabrics might come in handy (always be sure to look at the back, sometimes it's too loud or flashy but the back is just right).
Good luck,
Karen