ORIGINAL: Nogyro
If you're running out of plugs on the power strip, you can make your own. The first one I made I just took a double receptacle box and added 2 receptacle with one power cord. Then I came up with the idea of making a small box out of 1 x 2's. It's the exact diameter of a receptacle and they are screwed right into the wood frame, no plastic boxes under the receptacle plates. You can see both these in the pic that's attached.
There's a reason electrical boxes are made from materials that are relatively non-flamable. Your local fire marshall would probably have a heart attack if he saw your home made power strip. For safety sake I hope nobody else uses your idea. Multiple receptical boxes are readily available and are a much better choice than wood.