Good Golly Miss Molly! I think I'll need a cinder block wall planter next Spring. Not being a fan of cinder blocks, I'm happy to see them used in a design-i-licious way. Here's all you need:
12" cinder blocks
some extra blocks or pavers to glue inside the bottom of the blocks with plants
You can do any configuration you'd like plus the blocks are cheap and paintable so you can have pull them right into your outdoor color scheme.