Are you sure you need a rug? And is blue (assuming your jeans are blue) what you want? If so, go for it. I think a predominately blue denim rug with some contrasting white denim worked in would be nice in the right room.
Blue can be overpowering to decorate with, but that's another story. Working some white in would probably keep it from screaming BLUE at you! Also, the nature of denim sort of automatically gives a softness to the blues used in jeans. If you already have a room with other touches of blue, the new rug would probably complement it.
It seems like a braided, denim rug would be very durable, too. You go, girl!