I have amassed a colorful and papery amount of rejection slips, and I save every one (if you have ideas about how to put them to use, let me know--I'd like to do something other than wallpaper the bathroom). And, yes, occasionally I'll post about one. Like this:
Measuring in at 2” x 1.25” this notelet from the Seattle Review is the teensy-weensiest of all rejection slips. The edges are ragged, too, as if it were actually ripped from a sheet, rather than chopped up with scissors in a civilized manner. I wonder if tSR has fallen on hard times—just last year, their notes were printed on an entire quarter sheet of paper--that's a 300% shrinkage we're seeing here.
You know, I think editors should just cut impersonal rejection letters completely and invest in "you-suck" stamps--postage stamp rejections that can be stuck to writers' empty self-addressed enveloped and mailed back to them. Saves the mags paper and ink, save writers forty-one cents.