What to do with your old running shoes?

I go through about 5 pairs of running shoes a year, and though they are all dear to me, I don't have the apartment space to get sentimental and keep them.  

Usually, I drop them off at Nike's reuse a shoe program, which grinds down the old shoes into sports surfaces and playground materials.  

They have to be athletic shoes, no metal or spikes, any brand, no muddy or wet shoes.  And they can't be dress shoes.