I have made several different pairs of cat5 speaker and interconnect cables in the last year using designs from TNT audio. They have all sounded pretty good. It certainly changed the way I think about expensive garden hose sized cables where bigger must be better.
Here is a link to TNT
http://www.tnt-audio.com/clinica/triple_t_e.html
Here is a link to TNT
http://www.tnt-audio.com/clinica/triple_t_e.html