Wow, I love that scourer hedge/shrub look. Thats trully excellent.
Also, for the aquarium plants, you should look for around, as there are many many variety of these, which can make for some real cool varieties of tree. Also, a light coating of flock (better if not green- I like purples and reds), will make a nice alien tree/ tree covered in fungi look if done well.
Again, nice work.