Future Light makes the SwivelPar, which is a pendant-style Par20 that screws into a recessed outlet. It's geared mostly for event lighting for ballrooms, conference centers and such, so it may not be what you need.
List price is $84 for the white fixture, and you have your option of 7" or 11" stem. I'm pretty sure you can get it in black, but it would be a custom order, so that will add to the price/lead time.
If you'd like us to investigate, contact me offline ([email protected]), and we'll be happy to look into it.