A Variety of Silicone Cups:
The EasyLunchboxes Family of Goodies:
TONS of Cookie/Sandwich Cutters ... Multiple Sizes & Shapes:
CuteZCute Specialty Cutters & Tools:
Also a great idea but there are far too many to list: cupcake picks & rings! It's amazing the difference sticking a pick in a sandwich/fruit/cheese/whatever can make to a kid (or an adult, for that matter)!