Pour concrete over bunched plastic bags and 2 other supplies and guests cannot believe what it becomes

For a different look, experiment with adding color to the concrete mix using concrete dyes or pigments to match your garden’s color scheme. You can also adjust the size and shape of the boulder seats by varying the amount of plastic bags used and the way they are bunched together. Consider creating a set of seats in varying heights and sizes to add visual interest and functionality to your garden seating area.