Sure a rug can be a good way to conceal boring flooring or to add texture to a space or to keep your feet warm in the winter months.  But I prefer to use rugs as floor art!  They can bring big, bold patterns and colors to a space for a reasonable price.  A piece of floor art I am currently enamored with is Anthropologie's 9' x 12' Tufted Gingko Rug ($849, was $1648).
 
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