no, those photographs belong to someone else. You'll have to either find images from a site that will allow you to purchase/ license/ use them for free, or take your own.
That said, photoshopping your artwork into a stock photo is probably not the best representation of your work anyway. It doesn't give the buyer an accurate sense of scale, color/ lighting, etc. Your best bet is to create a small area in your home of studio that you can use to stage photos. Buy a few pieces of mat board to create different colored "walls". I've used homosote behind mat board to add structure, then just hang your work, add a few props, and it can look lovely :) Your cost is minimal -- a few dollars for the board, maybe $5-10 for lights if you can't use natural lighting. And then you can use it indefinitely!
If you want a quick way to stage similarly sized pieces, just take a staged photo of a standard frame -- empty -- and photoshop in whatever new piece you create. It will give a much more accurate sense of scale, which is one of the main purposes of a staged photo anyway.