There are many things that can be done with spare LEGO pieces or extra minifigures. -Donate them to a local children's hospital or charity. -Sell them online through sites such as eBay or BrickLink -Sell them to a LEGO store or a second-hand children's store, like Once Upon a Child. -Place them in a display case - this is a great idea for one that is less than $5! -Create artwork or crafts -Make stop motion videos