I grabbed a handful of craft sticks (bought in packs of 100 at the Dollar Tree) and started applying the stickers. I used glue to help them adhere really well and glued a second layer of sticks on the back for added strength and thickness.
These pictures were obviously taken after our stamping adventure. We used washable paint that we applied with paintbrushes. A stamp pad would probably be neater and give a clearer image, but we didn't have any washable stamp pads. Addie loved painting the stamps though and Ana was happy to simply paint with a brush on her paper. It worked out well for us this way. The images come out well if you don't slop on the paint (definitely don't dip the stamp into paint, it will smear everywhere.)
This was a great activity that everyone, (even Mommy!), really enjoyed doing.