We are so fortunate to have The Play Resource nearby and as members we can take as much from the scrap store as we can fit into a car! We usually go for a visit twice a year to gather up as many new resources as we can, mow of it is used for craft purposes but occasionally bigger items are in stock that be used for construction indoors or for play outdoors.
Earlier in the new school year I spied giant styrofoam pieces down in the Play Resource. I could only fit 2 into the car - they were about the size of a surf board. I had no idea what their purpose was going to be but knew we's have hours of fun with them. At first the children used them as a roof on one of the platforms on the slide, then the slid down them on wet days. They were light enough for the to carry about but solid enough to hold 2 children if they stood on them when balanced on some crates.
It is amazing to see them still being used almost 6 months later & for something so inventive. I ended up cutting one of them in 2 and last week one boy discovered he could fit them behind posts on the fence - 'Look at my new wall I just decorated' he announced.
I had also picked up some old 'For Sale' and 'To Let' signs made out of corriflute and when mounted with the white side showing, these are a great canvas on the fence for the children to paint on, you can see 2 of them in the photo too.
When it comes to free stuff, my advice is grab it while you can and worry about it will be used for later!