Here is a nifty idea I saw on (I think) one of The Hobbit wargaming Facebook pages. I often lose things on my desk as it is so untidy. Recently I spent ages looking for the Golden Fleece and a part of a Lucid Eye Amazon figure. Quite often loose shields disappear as well In addition, as it is usually covered in figures, I sometimes knock figures off the desk onto the wooden floor, which has resulted in several disasters.
So having bunged off a quick order to Amazon I now have a lot of plastic freezer tubs in which I have put figures for individual projects: IHMN, Frostrave, 1864, Lost World, NW Frontier etc. This means I can put the figures for individual periods I am working on in a box with shields and other bits. This also keeps the figures dust free as well as safe from knocks. I also put the paints I use most often in boxes by colour. I am sure everyone else does this already but I feel very organised!