I stayed away from them at first because to be honest they drive me nuts, but since I realized they aren't going anywhere, I joined them. Only with a class or two, and I don't camp with two of them like some people do. Throw on walls, corners, tree's, anywhere like you said that will be funny to kill someone with. Middle of the map. They are so small and blend in, the possibilities are endless.
Get a teammate to run C4... place them a few meters apart...
OMFG... the rage that results is too damn funny.