Red Planet

So, I thought I'd make an alien planet to give me somewhere for my Arc Rifles to invade. Here's a test piece made from some dark red sand and gravel from Hobbycraft and some plastic aquarium flora. I think it works well enough, and will probably now make a 4'*4' table in this style.

Not really sure what sort of alien to use. I want to avoid cool 40k style ones. Hopefully I can find something a bit quirky or cute and planetary-romance-ish.