some of the best pictures I've seen are.... wait for it..
take a picture of your monitor with a digital camera, TA DA instant kodachrome. (almost)
if not try playing with hue,saturation, and maybe variations (easy to use Image/adjustments) or play with levels (image/adjustments).
remember I think kodachrome film was 16mm so dont make the image too sharp, maybe lower the res, and then increase image size, (right click on the images name bar) add a bit of noise, film scratches etc.
keep it simple and dont over cheese it with filters and loads of effects.
hope this helps a bit.
