bonsai

So I find it's time for me to go for some new plants, live ones that is. I got a new cage, some new vines and need a small new plant to live it up a bit. so since its a smaller 15x15x30 screen cage I need something small enough to fit properly. Any ideas on what is a small plant I use? Something...

Sitting in my Bonsai tree having a go at all the passing cars!