I have never really seen a hobbyist-friendly method for doing plated vias. I have pretty much resigned myself to the fact that if I ever need anything that fancy, I'll just get boards made professionally.
From what I gather, it involves applying special conductive ink to the board to fill in the holes, baking it to cure the ink, and then electro-plating copper onto the whole board. I don't expect that the ink is very cheap, I hear it's VERY messy, and I don't expect electro-plating to be an extremely cheap or home-friendly process either. Definitely something more suited to a large-batch production system, as it would be done professionally, than for small-run hobbyist projects.