Wading pool gardens.

City Farmers use any amount of available space to grow food and get in touch with natural cycles. Having a tub, pot or wading pool garden would be a perfect use of vermicaste. The worm farm (you could make one of the pools into a worm farm) would compost all the garden waste. You would know that the scraps you are feeding to the worms doesn't have any pesticide on it so the vermicaste and leechate wont contain harmful chemicals.