New/Old Ceramic 70s Door Knobs

We bought a small box of glass and ceramic 70s door knobs off eBay over a year ago. I uncovered them when tidying up the laundry and put the ceramic ones on the four doors that had had the original timber handles "renovated" (i.e., replaced with dull, cheap, new plastic crap).

[2010 silver plastic crap (left), 70s orange/brown ceramic awesomeness (right)]

This is a process we would like to repeat all over the house, un-do the cheapo "renovation" and replace low-end 70s fixtures and fittings with high-end ones.