Yea I've tried that, it doesn't look good because the lamp is too tall. It's alright, that lamp came free with another Ikea lamp. Next time I'm around Ikea, i'll drop in and probably pick up 2 white frosted lamps of some sort to go on either side of the TV.
Or you can get backlighting like this:
http://www.cinemaquestinc.com/ideal_lume.htm