I dunno. I've seen some chatter about conductive ink, applied either by inkjet printer, or using a pen.http://www.google.com/search?hl=en&q=conductive+ink+pen But how does one securely attach components like resistors, LEDs, and transistors, and batteries, and the like? Conductive glue?http://www.google.com/search?hl=en&q=conductive+glue Or maybe you just use ordinary, e.g. Elmers(r), PVA white glue, and then paint/draw the traces on top of the dried glue? Obviously I don't know the answer to this one.