Digital Concepts for tank

Using Photoshop (Not a clue on how to use it, mind), I put together some concepts for the tank.

I started with a grey/black version. From there, I added a new layer and added colour over the top.

An early test was Red, as shown here. 

Taking a cue from Portal (Valve), I made a "Jungle King" version. Just a bit of fun ;)

I opted for a green tank, reminiscent of the army. I referred to this as "Starbug" whilst making it, as it reminded me of the Starbug from BBC's Red Dwarf. I added muzzle flares to the gun arm to add a bit of action!