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The squares need to be about 1 inch (2.54 centimeters) larger than the base of your bottle. Use a ruler to make the squares even. If you are a child making this project, ask an adult to help you with this step. If you need to, trim the dowels down. If you can't find any dowels, glue three wooden skewers together; this counts as one dowel. You will need 12 skewers total. You can use acrylic paint or spray paint. They can all be one color, or even different colors. Make sure that you paint the edges of your cardboard squares as well. Cover the bottom of your sand timer with glue, and press it into the middle of the first cardboard square. Cover the top of your sand timer with glue, and press the other cardboard square on top. You can use any type of thick glue for this: school glue, wood glue, hot glue, or epoxy. Place a drop of glue on the bottom of the first dowel. Press the dowel into the corner of the bottom square. Place a drop of glue on top of the dowel, and slide it under the top square. Make sure that the dowel is as straight as possible. Repeat this step for the other three dowels. You can leave your sand timer plain, or you can decorate it further. Here are some ideas to get you started:  Wrap some ribbon around the dowels. Cover the edges of the cardboard squares with glitter glue. Draw designs on the top and bottom cardboard square using glitter glue. Let the glue dry before you do the other side. Glue one some plastic rhinestones or jewels along the dowels. Add on some glow-in-the-dark star stickers on the top and bottom cardboard squares.
Trace two large squares on a sheet of cardboard. Cut the squares out using a box cutter or craft knife. Find four wooden dowels that are the same height as your sand timer. Paint the cardboard and dowels and wait for the paint to dry. Glue the cardboard squares to the top and bottom of your sand timer, and let the glue dry. Glue in the dowels between the cardboard squares. Decorate your finished sand timer further.