The plants are all real.
I find that my fish like real plants a lot more. And for me, they're a lot easier to look after and replace. It also helps a lot with cycling the tank. The two little round balls in my 55 are marimo. I love them, and they look awesome in any tank. So long as none of your fish decide not to eat them. You get a lot of comments from visitors about them too.
Thanks! I just got some gravel from the local hardware store, washed it up a bit and put it in. It was a lot cheaper than anything from any of the pet shops around here, and it works just as well.