Completing my tank

[Gradderz]

So my tank has been set up a little bit over a month now. And before I add frogs I want to add a few finishing touches.

As you can see the plants are growing very nicely!

Compared to when it was first planted...

I do however want some vines to go across the upper end of the tank for climbing and fill out the empty space. Where can I get non natural vines I could press into the cork bark to help it stay up?
I also want a nice thin layer of moss to grow on the floor...which moss will be best for this?
Also any recommendations on any other plants to add, or do you think it will become overcrowded eventually?