You could get some plain sticks (drum sticks lol) and spray/paint/decorate them valentine-sy. or you could get some budget price sticks (7 sets!) and do a different pattern for each day of the week! ooh, i might do that for my boyf who's a bit of a drummer too!
If you wanted to get him something store bought, you could get him some cool sticks or brushes. if you've got good funds you could get him a new cymbal.
hope this was a wee bit useful! let us know whatya do!