Toss anything that:
Has gone bad: Toss away that dried out glue stick and throw out that hardened paint. Anything that has gone hard, smells bad, or is past it's best before date needs to be thrown out. False starters: These are those craft projects you thought you'd love to try but either you didn't or you never got it started. For me it's beading. Let it go. Is broken: throw it out unless you can easily fix it and it's worth fixing. Anything ugly: Now this is relative but if you don't like it now then you won't like it later. Toss.