Plastic packers that chippys use for packing out door frames they come in all shapes and sizes and have nice receses in them, you can buy a mixed bag from builders merchants for about £ 3 or £4 quid. They come in depths of 1mm to 10mm. Grate for detailing the sides of scatch built star ships. Also false nails are great for armor plates on mecha, still not found anywhere that sells fake toe nails ( do they even exist ?) about 49p here in the UK.

UPVC window sills out of a skip and plastic gas pipe for flues, great for the base of scratch built starships and free from your local building site skip 

blitz