For the Wii Remote Costume we used a cardboard box that we wrapped with white craft paper. We cut out a hole for his head and arms. We left the flaps open at the bottom for his legs. We used Styrofoam balls and cut Styrofoam for all the buttons (including a B button on the back of the costume), except we used a clear plastic lid for the A button. We used black scrapbooking stickers for all the letters and numbers. For the squares on the front we used colored duct tape.
It was such a fun costume. It was easy to make and did not cost much to make, under $20 for everything.