Thanks @blogstar - I love eco-friendly ideas myself... and plan lots more such projects, which I'll photograph and write-up on here, happily. If your concrete is too daunting, what about making a raised bed, and tucking one of these in it? Surrounded by lots of plants and 'mulched' with gravel to stop water evaporating out of it too quickly it could look great (and raised beds are often easier to work - not such much kneeling and stretching! haha) Win Win!