Definitely a nice gift.
I use flax seed also and sometimes put a little lavendar in as well. In a pinch you can always use a tube sock - fill it with rice or flax seed and sew up the opening (or just tie it in a knot if you're hurtin real bad and need it quick!). Be sure to use a better quality tube sock though. The rice can be kind of sharp and can poke through if it's not.