In reply to Jenksie:
> (i'm fairly new to outdoor climbing)
The relevence of this statement being ?
In answer to your original question, I presume that you mean to protect the static ropes or slings used to set up the anchor, not the climbing rope itself which should not be rubbing over any rock at all. In which case, bits of old carpet, karrimat, trousers etc are all fine. Avoid using dynamic (climbing) rope for setting the anchors if at all possible - the stretch makes them more vunerable to sawing as they are weighted and un weighted.