Its not a forgery as long as it isn't misrepresented and there is already a market for reproductions see http://www.ebay.com/bhp/starry-night-oil-painting http:

Its not a forgery as long as it isn't misrepresented and there is already a market for reproductions see http://www.ebay.com/bhp/starry-night-oil-painting http://www.ebay.com/bhp/starry-night-oil-painting for instance (no connection to this seller, just came up in google). More than likely though you are going to get a better reproduction if you go with someone who specializes in that sort of thing. The people who do this do very much specialize, not just in doing reproductions, but typically in reproducing the style a handful of artists.