i would stick it outside for people to use as an ashtray... i get fed up of some people going outside to smoke then just flicking their butt end anywhere......
pix, we've solved that with a jamjar. There's a jamjar just inside our front door and another by our back door - take it with you, people, when you go for a fag, put your nub end in it, and screw the lid back on. When it's full, you throw it away and get a new one.
oh my sister does that pixi (hi btw), pokes them into the gravel and when it rains they come to the top...I've told her I'm saving them and posting them all back to her in a jiffy bag :o)