Step 1: Preparing the Paper
First what you need to do is take some paper or sawdust. Take this and place it in a big bucket. Fill it up with water to about the same level as the paper.
Now rip the paper into small pieces until mixture is like mush.
Step 3: Mold
Take a mold, I bought mine off eBay for $20 but you could make a homemade one out of pvc pipe, and squish the mush into a block.
Step 4: Finished
Let these dry and now you have an unlimited source of fire bricks to burn using just water and paper. Congrats on your free heat for your household.