These are my humble efforts for the collography part of our first year life drawing module at uni. Working from a sketch, I attached bits of material to a piece of card ~ 8'' x 6''. The first image is an intaglio print, in which the ink is gently painted on then rubbed off of the top surfaces. I did another print like that one before switching to relief printing, first gently rolling the yellow ink on to the top surface before rolling the darker and more opaque red very lightly over the top.
There are some parts of the intaglio print still visible on the relief print. I think it would have looked even better if more of the ink from the intaglio method had stayed on, to produce a nice hybrid of the two - the intaglio method for body and depth, the relief method for highlights.