I have two 90g tanks.. one is LR
heavy, with a good bit of macro algae types 'planted' in it.. very nice looking, and since I have a couple of emerald crabs I don't really have to prune it back much (do have a seperate culture tank (20g) as well cause they eat alot it seems).
The other tank is on it's way to maturing to be a seahorse/cardinal tank.
In it I have a few varities of seagrass that I just got in and it looks really nice, but requires a good deal of light.
I love the look of a planted tank and would eb happy to pm you with the links I have found (the 'true' 'plants' (i.e. seagrass) seem a bit harder to procure, so you'll have to be patient and order em from someone that will go harvest you some properly)