A recent TV special on the Shroud of Turin showed how anyone can make their own Shroud. Simply get pretty dirty doing yardwork, or by failing to bathe for a while, then exercise for a few hours to get really, really sweaty. Wrap yourself in a clean linen sheet and remain motionless for 12 to 24 hours, allowing your perspiration and skin oiis to permeate the fabric. Remain motionless. After the fabric has absorbed your fluids, allow the stains to set for a few days/months/years and never allow it to be washed. You now have your own Shroud! The special actually showed someone do this, and the result was passable. They also showed someone make a primitive "photograph" using a camera obscura (a room with a tiny pinhole in one wall), plus a body hanging on a rope and a specially saturated linen on the wall as "film". This also worked passably well. The special also mentioned how the existence of the Shroud apparantly was unknown until the 1300's