Too funny, basically you make a thru-hole perf like board that is custom for your circuit, and fill in the channels in the back with conductive material (solder, conductive ink and or paint, or glue). It actually looks nice too. Heck this method you can make a 3D circuit board.
http://www.instructables.com/id/3D-Printing-3D-Print-A-Solderless-Circuit-Board/