I finished a batch of "Large Green Aliens" from Peter Pig this weekend. I've had these miniatures for over 15 years, but only now did I finish them. I painted up the infantry figures 15 years ago, but only came around doing the cavalry now. They have a certain old-school charm to them. I even had to provide my own spears (simply steel wire), so that's definitely old-school!
They are intended as 15mm, but since they are "large" aliens, they can as well serve for 25mm. They'll probably appear in our Antares campaign.
These aliens have 4 arms each, ride 6-legged steeds, and are modeled after the Tharks from the John Carter novels by Edgar Rice Burroughs. I am usually not concerned about canon colour schemes for aliens, but I kept them green anyway. I have no idea what the "official" colour for their steeds would be.
The base is kept simple (some texture applied), and painted a reddish-orange as is appropriate for Mars.