This actually seems like a fairly simple endeavor for those with the proper tools. Anne and her husband took a hacksaw to a candelabra, separating one of its arms from the base (sounds gruesome, but not too difficult!). Then they connected the arm to their plate by drilling a hole through both and using a screw, two washers, and a cap nut to finish it off.
Anne has posted some helpful photos and more detailed instructions on the Design Daily blog at Point Click Home. Jamali Gardens is her go-to source for affordable materials for this project; you could also certainly find some workable candelabras and plates at flea markets and thrift stores.
Enjoy your mood lighting!