Quote - You can load a Poser 1 sided square, load your texture onto it, and you prolly either need to save your texture as  PNG to preserve the transparency, or make a transparency map.

I agree with this, i have used the "square texture trick" allot, after loading it onto your cube you can flatten it to make the square your image rests on a thin, set like prop.  I have done this for posters, a height wall and various such props.