One thing that I sold at craft shows, that went as soon as the people saw them, were "Tooth Fairy Pillows". I made small ones, about 6" x 4" and sold them for $3 ea. You have to make a pocket for the tooth but make it big enough for a 50 piece or a dollar bill. My grandson thinks his teeth are worth $5 each because his is "special". Use cute children fabric and put a bow on the girl's. Good luck.