Hold on there Nem. What I would do...

Make a texture with the background you want.
Make a texture with the circle logo on it. (Transparent BG)

Make a layered shader. Delete the green box. Open your Hypershade, and drag you two shaders into the layered shader, making sure your logo is first in order, (on the left.)

That way, you can have a comlex bg, but have your logo on top of it.