I have seen fly strings (you know the things that hang in your doorways to keep the flies out, like at the fish and chip shop) made from (washed) plastic bottle tops (all kinds of bottles; different coloured milk lids, pop tops, roll-on lids, detergent lids, pretty much any lids of similar size that can be washed successfully).

Paper people can be cut out and stuck to empty toilet rolls so they stand upright. I also draw on the rolls to make phones.

Painted jars hold tea light candles for your summer bbq's.

I have a book with a heap of ideas in a book i think. Have fun!