What about a memo board? You can buy those corkboard tiles at Wal Mart and I think they're 4 packs, for about $5. You could stamp on them, alter them, make fun matching tacks, etc., and the girls could use 'em to decorate their rooms, and pin their notes and pictures onto, etc.
I would think they would adore something like that!
Ooooh--you could make glittery chipboard monograms to put on one corner--so personal!
HTH,