For me, the MC14 picture frames are a definite miss.
I really don't like them. I find them to be distracting unnecessary clutter that pinch a few pixels away from the actual viewiable thumbnail area, and feel that they are especially ugly when the thumbnail rolls up to show the three hidden menu items. The larger the thumbnail size, the worse this ugly effect is, and when in 'fit to window' mode, not only is it at its worst, there's no hiding place for the mouse either, meaning that so long as the mouse is in the picture window, the image on show is always 'rolled up' showing those three totally redundant menu items.
I don't like to be negative, but I do feel quite strongly that these frames are a bad idea. Gynor and drosoph have both mentioned making them optional, but knowing historically that if every 'make it optional' suggestion were implemented, MC's options dialogue would be a very scary place indeed.
My suggestion is to just ditch the frames altogether.
Does anyone else have an opinion?
-marko.