Louis, for the Very Thin Jumpers, uses strands stripped out of LVDS cables (that go from a laptop motherboard to the LCD).
You can also get old IDE Cables from older computers (linking the Harddrive to the Motherboard). Those are handy for use as muliple ribbons, or rip them in pieces for Insulated jumpers. Or Strip even further for indivual strands.
Just grab some faulty 2nd Hand Gear (Monitors, Hifi's Etc), and cut out all the wires you need.