Picture of Indoor Throwing Range
If you want to throw a ball around, and you can't or don't want to go outside, this is a simple and cheap solution.

Step 1: Materials

Picture of Materials
What's Needed:
Thin, Light-weight, Fleece Blanket ( I got mine on sale at "Micheals" for $0.90)
Two Thumbtacks
Wooden-Frame Doorway
Tennis Ball