Transfer paper is sold at Staples and most office supply stores... usually peel and stick....
you can make t-shirts or anything you see on your computer with it . you can grab it ,print it, and transfer it...
there's newer products out on the market too
i've seen awesome photos transfered to cups and far less porous materials than
wood...
how you go about sealing that image onto a plug
though is not my area of expertise...
