Here is the place to post little knick knacks that can easily be done with things found in an average home. I'll start it off:
Internal antenna:
Materials: Plastic soda bottle
Procedure: Cut a 2-3 inch wide section from the bottle so that you have a fairly long 2-3 inch wide strip of flexible plastic. Then make holes along the sides; Wide enough to be able to weave the antenna wire through. Make sure the holes aren't too rought or you'll cut your antenna wire!