I am writing a overhead, 2D shoot-em-up game, and I need a few BMP files of end of level bosses. They should be either be air vehicles (planes, helicopters, etc.) or ground vehicles (such as tanks), and hopefully they''re the type of enemy that has several "components" and you have to destroy them one-by-one to kill them. Can someone post the URL of a site where I can find such files?