Aquarium plants (Hollingdean)

I'm just setting up a new fish tank and want to get it planted. I'm particularly hoping for plants that spread, so they fill in empty spaces and give it a natural random appearance. If you have anything like that which has spread too much and can be thinned out a bit, it would be great to grab some off you. Don't mind if they are short or tall, floating or rooted. Anything would be appreciated. Thanks