First off, apologies for the slight advertisement tone of the first minute of this video, but I promise there is a real project under all of that! (The reason being this project first featured in Microjig's newsletter)
Moving on, in the video above I build a simple set of expanding desk draw dividers, to fit the size of almost any draw, out of reclaimed plywood and pine. The only tool needed is a tablesaw, and perhaps a power sander if you have one.
If you would like to build this project yourself there are free plans available in the form of a PDF on my website, see here: http://thiswoodwork.com/desk-draw-dividers-free-plans/