I ran across this video yesterday that shows how to make an almost free Wi-Fi extender for your house using aluminum foil, a piece of paper and a little glue. This is great to maximize your signal strength and range by basically Just aiming the extender toward the pc or area you want signal to reach.
The template and full instructions are located here. http://www.freeantennas.com/projects/template2/index.html
If you don't have cardstock you could use a Wheaties box. Not sure if you could print that or not but you could certainly glue the template to the box and trim around it.