Well, I make quite a few wallpapers myself, so my suggestions would be as follows:
1) Try to give the background a little more 3 dimensional feel with another layer and some lighting effects.
2) Add some cool looking, yet simple text. After that, you might try copying that same text, making it larger and turning doing the opacity.
3) Micro text. Personally, I love microtext and I use it often. Through micro text in with some neat, simply monochrome shapes really helps, I think.
4) Try messing around with the colors on auron. I find that a really neat effect, (assuming that you're using photoshop, because that's what it looks like) is to copy the layer that Auron is on, and then blur that layer. After that, just mess with the layer style. I usually put it on either "Lighten" or "Overlay". Anyway, if you change the color of the copied layer you can get soem really cool effects.
5) try adding things above the Auron layer, like in this sig:

with all the little...knick knack thingies. Haha.
Well, I hope that helped. :B