If you want to check out the progress of our son's sensory room including everything going into it you can check out the info page on his website: PawsForScotty.com.
Step 1: Collect Your Materials
* 2 - pieces of fabric the size you want your crash pad to be
* a comforter cover (or 2 more pieces of fabric an inch or so bigger than the other 2 pieces)
* thread (hopefully you won't see any of it so color doesn't matter too much)
* stuffing - I suggest shredded foam (I used old couch cushions,) I also used the stuffing from an old been bag chair
* Sewing machine, I suppose you could do without this if you are up for a lot of hand sewing
* a hand sewing needle (and you probably want a threader)
That is it. The only thing I had to buy was the sewing needle since I didn't find mine until after I bought some new ones. For the base fabric I used two pieces of fleece (about two yards each) that had been laying in our basement unused for at least 4 years; you could use just standard cotton fabric or two bed sheets. The comforter cover was also laying in the basement unused, you could just use two more pieces of fabric and do a small amount more of sewing. You are going to make two pieces, the crash pad itself and a cover, which can be removed and washed.
For stuffing I picked up some old couch cushions, which I shredded, and some stuffing from an old bean bag chair.