I really love the nested square beds! Like terraces or a stepped pyramid.
Cool avatar, too!
Someone posted an idea somewhere for using concrete glue (it comes in a tube like caulking compound and can be applied with a caulk gun. It's easier than mortar and may be stronger.)
They took 5 paving stones, 12" x 12" x 1". They made a 1-cubic foot planter by standing 4 pavers upright on top of the fifth, gluing them into a square or cube. I think they knocked off some corners on the bottom or drilled holes for drainage. That's over 7 gallons and very stable. However, you have to position it where you want it and leave it there! It's pretty heavy for moving around.
