Using lemon yellow is a brave move on its own, but using it in a geometric, asymmetrical pattern like this takes it over the edge.
For a less expensive, more conceptual take on an area rug, try a square of color on a painted floor. The high-gloss finish heightens the contrast between the brown and the surrounding white.
We've seen brick painted out white many times, but fuschia...not so much. For more ideas, check out Alcro's inspiration gallery.