Flipping through the pages of a Pottery Barn catalog you'll see they love to use groups of dark colored frames on the wall. You see it and think how awesome it is, but then you see the price. That wall of frames is likely to run into the hundreds of dollars.
That is when you take your vision and idea and you run to your nearest Walmart. Walmart carries picture frames that look expensive, but are really faux wood and they come in the fabulous dark espresso and black colors. You can get 8X10 frames for about $3 each. A far cry from the $40 each you would pay elsewhere.
Nobody needs to know how much you didn't spend!