You can build a simple organiser for your stuff out of pretty much anything, but if you want to make something to fit your exact needs, it's a little more difficult. Design for Mankind's solution is a stack of cardboard sheets you can customise to suit your needs.
The idea is that a stack of cardboard is very durable but easy to work with. Subsequently, you can make a little organiser with your own sizes, shapes and compartments to suit your needs. Even though it's cardboard, it doesn't look too bad and could come in handy for things like electronic toolkits, desktop junk or as a makeshift junk drawer. Head over to Design for Mankind for some tips on making one for yourself.