I had one of those! They were so cool. Here's a lil' inspiration for you to go along with. It's not my tank, but I did the same thing to it. I added a cork/bark background on mine and covered it in mini pellia. The background was about 1cm thick so it didn't take too much space. As for the foreground, fissidens moss and anubias nana petite. I wouldn't recommend any rooting plants in this tank. The top is covered by salvinia. The light was a desk lamp. I had a few shrimps on mine, but sadly they died after 4 months. I'm guessing it was the spring time temperature fluctuating. A few nerites or assassin snails will be neat in here.
Currently out of the hobby
Forum lurking every now and then