All of the materials came from crafting items that I already had at home, although if you're starting from scratch, many great things you can grab from The Dollar Tree.
Whether you are welcoming fairies, gnomes, trolls, or other mythical creatures to your yard, I think a "garden" is a great activity!
This particular kit contained:
Flat marbles in varying sizes
Sea glass (I actually made this, but you can buy it in craft stores)
Pixie dust (glitter)
Rocks (for landscaping, from a hardware store)
Decorative sticks (for decorating potted plants and gardens)
Crocheted fairy pillow
I crammed it all into a spare terra cotta pot, and added ribbon.
A sandbox is a perfect spot to play, even if it doesn't have sand in it yet ;)