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Edit: added estimated costs of materials and board "standardizing".
What you will need:

1. Dow foam insulation. This can be found at most construction supply depots. It comes in blue or pink sheets. It comes in 2’x8’ sheets, so you will need 2 of them.($28 each)
   
2. 3X 2’x4’x 1�” pre-cut plywood sheets. These can be purchase at any Home Depot type store.($4 each)
   
3. Heated wire foam cutter and Hot Knife.($15 for the wire cutter)
   
4. 1 or 2 tubes of subfloor glue.($3 each)
   
5. 1 or 2 tubes of ACRYLIC latex caulking.($3 each)
   
6. 1 caulking gun.($8)
7. 1 plastic tarp to work on. ($10)
   
8. 1 long bladed utility knife or kitchen knife.(Free, as long as your wife does not catch you!)
   
9. 1 bag of play yard sand. These can be purchase at any Home Depot type store.($2)
10. 1 sheet of 1�” masonite board.($4)
11. 1 quart of black latex wall paint ($5)
12. 1 bottle of cheap white acrylic craft paint ($3)
13. 1 bottle each of yellow and dark red/orange cheap acrylic craft paint.($2)
14. 1 sharpie.($1)
15. Something to cut masonite boards with. I used a Jigsaw.(Varies)
    
16. Sandpaper to smooth the edge of the masonite templates.($2)
17. 1 large paintbrush and 1 medium sized one for painting the lava rivers.($5)
18. 1 small can of Drywall patching compound. ($2)