Right on Deena! I have a planted one gallon and it has replens, java moss, moneywort and baby java ferns. I love mine. I just trim or replace when the plants get big. I actually started it when for convenience sake I used to toss little plant pieces into it when I had a few leaves or stems that were too small to root into the bigger tanks. I had to take the christmas tree moss out as it absolutely took it over.
If your tank is getting natural light by a window, I'm sure it will do well as I keep all kinds of aquatic plants in glass bowls next to a window at work. They grow just fine.
Its nice to see someone else exploring tiny tank possibilities!