WOW nice nae. Mine are just super simple rounds with a hole for a door...you'll have to tell me how you made it look so nice!!
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The basic recipe is the one i use, but i'm sure anything similar could be used.
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You will need:
2-2 1/2 cups flour
1 cup salt
1 cup water
1 1/2 tablespoons vegatable oil
Krylon waterproofing spray paint (Called Matte Finish...it's clear)
Texture spray paint (instant stone!)

Oven-safe mold [In my case, I used a banana bread tin, some people have used store bought hides and just used them as the mold, can use oven safe cermic bowl, pie pan, anything oven safe!]
Mix the flour and salt, then slowly add the water and mix. Mix in the vegatable oil and mix until the dough is not sticky but not too dry to mold. Add more flour as necessary.
Roll dough flat about 1/2 inch thick with a rolling pin. Put a thin layer of vegatable oil on the mold (very important!!), and then place the flattened dough onto the mold and shape it, make sure you cut out the door for your snake! (I found it easiest to place the mold on top of the flattened dough upside down, then flip all over at the same time and the dough is on top of the mold without ripping/stretching)
Place the dough-covered mold onto wax paper or parchment paper on a cookie sheet, and bake in the oven on 250* for about an hour. Depending on the mold, you may have to take it out, take the mold off, and flip it over to bake on the oposite side too (I had to do this for mine).