speaker cable tie-downs in room?

Search the internet,it's a wonderful tool.

I sent you a email with a few links to check out...and this should at least give you an idea of what to look for.

I bought some white plastic channels at Home Depot.

http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?jspStoreDir=hdus&catalogId=10053&productId=100657480&navFlow=3&keyword=wire+channels&langId=-1&searchRedirect=wire+channels&storeId=10051&endecaDataBean=com.homedepot.sa.el.wc.integration.endeca.EndecaDataBean%408a3757f&ddkey=Search

They come in 5' lengths with various connectors to cover the wire where you link them together. Cheap, effective, and not unsightly. They are backed with adhesive and a peel off strip. The toughest part was snapping the channels closed once the wires were inserted. Of course, the best bet, if possible, is to run the wires through the crawl space above the ceiling.

If your primary interest is in making the installation be the least visually intrusive you could glue the cable to the wall and then paint over both the wall and cable. Of course, that means reworking the wall if you take down the cable and that could be a problem if the wall is textured.