Here's what you need:
Paper to make the valentines (I happened to have some pre-cut hearts, but you could have your child cut their own hearts, or even use smaller paper cut in any shape. Then I put together a box of random stickers, papers, tape, glue, scissors and markers and set them loose.
I started Henry's for him and then he decorated them.
Ella loved the little felt stickers that I found at Joann Fabrics...they were super cute!
I basically just provided the materials and then let the kids get to work. They did not need much help from me, and really enjoyed themselves. And our valentines are ready to go! Now...to make the valentine boxes....