Ok, so it's been a while for this thread, but I thought I'd update everyone! I ended up using this design for the PVC quilt stand:
http://www.quiltfrog.com/QuiltDisplayRack.html
It cost me $32.20 at the Home Depot, and they cut the pieces for me so all I had to do was assemble it! I used 1' pieces on either side of the t-joint for the legs, 3.75' sections going up the sides, and 7.5' cross bars. The quilt should cover most of the stand, though a little bit of white might peak out the sides. I don't think I'll bother with painting it for this show, but maybe in the future at some point.
I talked with the show coordinator and I managed to get a wall spot with electricity, so hooray! I tried to set up the rack in my apartment to show you all the rack with and without the quilt on it, but my ceilings are too low! So now I have to set it up outside some weekend day when it's nice out. I'll be sure to post the pictures!