Remove the bench top if it is detachable. If it has padding and a fabric cover, discard everything except for the base plywood.
Apply Contact paper to the back of a plate. Place the plate between the layers of an old bath towel and tap with the rubber mallet.
Uncover the plate. Peel the broken plate pieces from the Contact paper, one piece at a time to keep the design intact.
Glue the pieces to the bench top, leaving a gap between the pieces for the grout. Glue the pieces keeping the plate design together. Use the nippers to further shape individual pieces on the mosaic garden bench top.
Break additional plates and glue the plate pieces randomly around the initial design on your mosaic garden bench. Continue until the whole mosaic garden bench top is covered. Allow the glue to dry thoroughly before continuing.
Apply the grout to the mosaic garden bench top and cover well. Fill in between the mosaic plate pieces. Allow a few minutes for the grout to set up.
Clean away the grout using a wet, then damp sponge. Rinse and repeat until the excess grout has been removed and no more grit remains. Allow the grout to dry.
Remove the film from the mosaic garden bench top and polish the tops of the broken plate pieces using a rag.
Replace the mosaic garden bench top on the bench frame.