Light elements - the bad ones from Exo-Force which don't work very well, and the great ones from new sets.
The plants cover an old path that is rotten. The garden is a carrot garden. The rocks are surrounded by mist.
The building had been sitting around for quite a while (I think I wanted to build a fanon LU area). Eventually I added the garden, and then quite recently I added everything else.
Unfortunately, plant parts are really badly designed so they don't stay in place. I considered gluing them somehow just so that I could move this from one room to another without it falling apart but instead I just dealt with it and put the plants back as best as I could.