I love live plants! I currently have five in my 10g, and one of them I'm growing from some seeds I purchased at walmart. They make my tank look so much more full and pretty. :)
The only problem I ever had was lighting. I think I gave them too much light actually. I would open my window blinds every day before school so a lot of sunlight would come in. And the plants looked like they were dying, but I think they were actually growing extremely fast and just shedding off their leaves and ferns. It was crazy but I found the solution, which was to just close my blinds. :P Pretty simple. And my shrimp loves to hide in them.