Greeeeeaaaaaat.....I just read a blog that says not to use felt on these microwaveable rice bag creations because much felt is made from polyester, and polyester will melt in the microwave. Of course the same blog suggests using fleece, which is also a type of polyester. It melts when over-heated. Ideally, you should use a 100% natural fabric like cotton. Oh well.
Anyway, here is the tutorial I used.
Applique just bores me to death.