With the 10 gallon terrarium, I recommend keeping the plants in the pot. I thought I had a perfect substrate terrarium, having the water flow down into the bottom, I even drill a hole at the bottom since it got flooded with rain, it worked decently, but the environment just isn't right for them. They tend to heat up during my direct sunlight. So I keep moving them into the shade. With direct sunlight its way over 90 F, with around 85% humidity. Some of the tips started to burn. So keeping pots in the terrarium so you can easily move them is the way to go. If you think its plain you can puts live sphagnum moss as the substrate and the terrarium over it. It looks pretty. And if You still think its plan, but some drift wood in the back, make a crack in the driftwood, put some potting mix, and add a plant in the crack, and allow the some moss to be formed around the driftwood. Its pretty =D.