styrofoam
 

Any expert care to comment on my comment ? re Petrol etc..

make a planter
 

Another use for directly recycling it (i know you didn't want round the home ideas but someone might ) make it in to a outdoor planter but out unwanted shapes make holes in bottom cover with old chicken wire render with cement sand and potting compost mix the quantities can be found on the internet, i found this in a big garden design book done by the times i got from the library thought it might interest some :)

It's been a long time since I've been on JT and I can see Polystyrene is still problematic. At last I have come across something which we can do with Polystyrene.......you may need some skill for this though....

http://www.youtube.com/watch?v=iaWHw-CfLGc

Good luck!