I can understand you not wanting to pay the cost of these blanks but they are like anything else and just because people call them worthless wood blanks don't expect it to be that (worthless wood ) I have made several of these blanks myself and if you look at the work and the equipment needed to make these blanks eg pressure pot and the molds in the end if you are not going to make blanks on a regular basis it does work out cheaper to buy them.
Cheers Ian
Right on the money Ian. Jim, although the learning curve isn't steep, the cost is high. To answer your question, you need suitable wood, resin of some kind, a mold and in most cases, a pressure pot to 1) diminish the size of the air bubbles in the resin and 2) help adhere the resin to the wood. They are also very time intensive if you work or have limited time.