I was sorting through my yarn the other day (again, where does it all come from?!). I realised i hade quite a few different gray left over yarn bits from different projects (seems like i enjoy knitting in grey) which where all a bit to soft/fluffy/expensive/generally nice to go to waste.
The small amount was just enough for a hat.
Crocheted with hook 6.
Another fun way to make use of scrap yarns is to make a yarn ball wreath, instructions here