I try to recycle lots of things. The plastic bags that the organic sliced bread we eat comes in are used again and again, I even take paper bags with me when I go shopping to avoid using new ones. I do keep things that "might come in useful" and they often do eventually. Today I bought a beautiful skirt in the sales but it's slightly transparent. I don't own an underskirt, but I had kept an old black viscose skirt whose waistband had gone loose and that had become very thin and soft, but that I couldn't bring myself to throw away. So I cut off the old waistband, and turned a hem in the top of it, thread through a piece of elastic and voilà I have a recycled underskirt!
I also own lots of polyester scarves, some of which are worn out too so I've cut them into small pieces and will be using them as stuffing for a future amigurumi project. I'm sure it's also possible to recycle yarn but I don't have any old jumpers to unthread so I'll make my way through my stash first. Do any of you have further recyling ideas?