One of the oldest alien races in the Marvel Universe, the Skrulls were first seen way back in Fantastic Four #2. As green bug-eyed shaper-shifters, the Skrulls were practically taken from any alien invasion movie that were popular at the time - the comic book answer to the belief in "little green men from Mars".
Over the years, the Skrulls were change from little green space men to a galaxy-spanning alien empire to their most recent incarnation as one-dimensional religious terrorists (way to be current, Marvel!). But I've always kinda liked the Skrulls as they first appeared, with their bug-eyes, their wide frog-like mouths, and their good-natured incompetence. And the Jack Kirby artwork didn't hurt, either. And so, I made these customs Skrulls in tribute to their first appearance.