I would suggest getting either java fern or anacharis. Anacharis is a fairly tall plant and my fish love to play in it.
As for more decorations, I personally think the petstore items are extremely tacky and with the elegant setup you have (great work by the way, it's beautiful!) I would suggest either more rocks stacked in a way that resembles a cave or some of those tiny tera cotta pots that can be bought at most hardware stores. My fish love those too. :)
If you do choose to use pots you should boil them and rinse with the boiled water to make sure they're completely clean before placing them in the tank.
Oh oh! I would also recommend a small piece of drift wood to fill out your tank. Just a suggestion though. It's all up to personal preference.
Also, I don't know much about them but I've heard mystery snails do well in smaller tanks like that. However, I've also heard that they make the tank dirty. Not entirely sure on both accounts though.
Last edited by dramaqueen; 04-20-2010 at 08:43 AM.