Agreed. When DD was first getting checks, I tried to spend it on things she would need. But I quickly realized I was sorta wasting money that way and we opened an account in her name. The money is still available when she does need anything, although our plan is just to leave it alone.
If you don't like that idea, I would go with wardrobe needs or an outdoor toy.
SAHM to Magnolia May (09/10) and Luke Russett (04/13) and wife and best friend to my airman.