I saw Starcom mentioned earlier. I think I almost had the whole set of those guys. Everything had magnets and either shrunk or grew. They were my favorite things ever. I remember making them have brawls on the refrigerator. Every now and then when I pick up some crap in my room I find one of those little guys. The guys who all looked the same, with different repaints and stickers. The only one who I think never had a repaint was the robot one who was on the bad guys side. I accidentally broke the leg off one of the guys, and made him "The angry cripple who doesn't need help from anyone and flies the fighter ship."
I found some Army Ants in my garage, and they all had the asses pulled off. I had a really cool tank one too.