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Measure the dimensions of your backsplash. Using a large sheet of paper or cardboard, transfer the measurements to the paper, then use scissors to cut a template. Set the template in place and tweak it until it fits the backsplash area perfectly.
Cut the holographic sticker sheets (available at arts and crafts stores) into squares sized to fit your backsplash (3" to 4" squares work well). You can use the same color or add more texture and interest by mixing colors (Image 1).
Peel off the backing and begin sticking the squares to the backsplash in a checkerboard pattern (Image 2). Leave 1/4" between the stickers to create a visual "grout line."
Transfer the shape of the backsplash onto the plexiglass using the template. Use a circular saw fitted with a diamond blade to cut the Plexiglas to fit the backsplash. (Follow all safety precautions when using a saw.) If you'd prefer not to cut the Plexiglas yourself, take the measurements to your window or glass dealer and have them cut it to fit.
Once the Plexiglas fits the backsplash area, drill holes in the corners. Mount it to the wall with finishing screws and grommets. Different hardware will give your backsplash different looks.