Working on crochet jewelry mostly composed of flowers, leaves me with a large amount of very small yarn balls. I am talking about tiny balls less than 10 grams. These, as you can imagine, are very difficult to store, so a practical solution that works wonders for me is to store them in glass bottles and jars. That way I always know what colors I have available at hand.
I store slightly large balls and cakes in wicker baskets I have in several sizes and this cute bamboo chest above I got from my mom.
Looking for ideas on the internet I found this image posted by Shelley of yarn-filled trays placed one of top of the other and I just love it! This looks like a huge space-saver.
Wool Free also loves to use jars, but she has her sorted out by colors, while Kristin repurposes egg cartons to stash away her yarn balls.