Last year I decided a little late to plant more tomatoes, actually my son was listening to his IPOD and plowed up an extra 1/2 .
I needed more plants but the green house was full.
I looked around and saw the kids Trampoline and the idea hit me. I took some old black barrier plastic barrier fencing I pulled at the end of a job when finishing the landscaping and wraped it around the of the bottom to the Trampoline.
I then potted a bunch of seeds in trays and set them under the Trampoline. When a freeze warning came I threw a couple of small tarps on the top of the Tramopline to protect the seedling.
The kids still got to use their Trampoline while the Tomatos grew underneath.Water them was easy just spraying water on the Trampoline and letting it drip down.
Maybe you guys have some things you improvised to share that we can all learn from.