Wanna start repurposing sweaters?
Here's how I do it:
Buy 100% wool sweaters, angora, cashmere, etc. No nylon, acrylic, or other man made fibers.
(this is if you want it to fully felt. If you are sewing an owl or pillow out of sweater, it doesn't have to be 100% wool because the edges will not be exposed.)
Wash like colors in hot water.
Throw them in the dryer for at least one cycle on a normal or high.
Dry repeatedly if you want a thicker wool.
You can then cut the sweaters and the edges will not fray.