Why not try Jon Risch's quick & dirty bass traps? You can make 4- 4 footers in a day and if you cover them with grille cloth they are not an eye sore. Although my ratty looking ones are covered in burlap, they are quite effective.
Mark, don't know if you've built the Jon Risch's traps many times or not, but I built 4 four footers, my first time, and it took more than a day, and that was with another friend. It took us two days, at least, of cutting particle boards, hogwire, and fiberglass. It's not as easy as it looks!
Then covering it with burlap, that took some time too!