Hmm, I think ebay sells McCoy pottery. Have you tried a google search--all the rage these days. Here is a link that might be useful: McCoy Pottery

Is it cloisonne? It's almost abstract. You'll have to search eBay and auction sites to see if there are results. It's either worth little or else extremely rare.

I think aucitio is "auction", maybe French or Spanish, but I couldn't find '3911 vase' using google or ebay. It's a very pretty vase!

Considering how much you've put into the kitchen already (much of it sweat equity, but I'm talking materials here), I think it wouldn't be that much more to put a cabinet in to match the others - call the place where you bought the others. They make them in standard sizes for standard fridges, I don't know how deep your niche is but I'd go just to the edge, since it looks like one side is deeper than the other, and trim out the whole thing with the trim you used around the windows and doors. I *love* the curved "rosettes" - very Art Deco looking! That way your fridge would look built in, in a unique way instead of the "trim out with matching side panels" like I have in my kitchen. Can you bump out the wall on the left side of the fridge to even up the niche depth? If you can't afford the cabinets for now, you could just trim out the opening (either on the left and over the top, deadend into the wall, or wrap around the right too and run the trim up that edge on the right of the fridge). I just want to see that sharp drywall edge over the fridge softened like your other beautiful casings!