DIY Cardboard Maze
Use cardboard to make a maze for your guinea pigs or other small pets! Cut long rectangles of cardboard. Arrange the pieces of cardboard a maze pattern, then mark each piece where it will need to be cut with one piece having a slit coming down from the top and the piece it connects to having a slit coming up from the bottom. Cut the slits, then cut open holes or fringe holes for doorways. Slide the slits together to build the maze.