I usually find I have a few partially completed projects around and to save losing parts I keep them in containers which I might have otherwise put in the recycling. They will also take their place alongside the more traditional drawer-type storage systems. Fish tins and Chinese takeaway containers are two things ideal for this. Run them through the dishwasher and give them a new lease of life as storage bins. If you're feeling adventurous, glue a few together to make a storage rack.