Rag rugs are a vernacular staple in the home. And denim is a rough-and-tumble material that holds up to weather and wear. Combine the two and you have a floor covering that's suitable even in this winter weather:

1 True Blue rag rug from Land of Nod is for children's rooms but we think it's suitable for grownups, too. $250 for a large 8x10
2 handwoven recycled denim rug by fiveforty on Etsy, $275
3 heavy and light combined in this denim and feather rug by Katarina Lees
4 and here's how to make your own, via Little House in the Suburbs