I made it in Paint Shop Pro 7 with layers. Esentially, there is the bottom medium green layer (the grid), the top layer with the dark green and the objects, and there is a middle layer that is transparent except for a vector with a gradiant fill. Then I moved the middle layer accross the image and captured a frame for each stage and assembled them in Animation Shop.

This was my first sig, and the head and name were shamelessly filtered, though I went through a fairly complex proccess to get the effect I wanted on the ship...