I have just installed about 15ft of cat6 ethernet cable from the router downstairs, along the wall then up the wall and along the stairs using cable clips. Only took me 15 minutes and it doesn't look half bad. Might take some pics tomorrow... I just have to paint the cable to match the carpet XD
I will be doing this as my carpet appears to be super glued to the floor, at least i cant get the edges of it to budge much at all.