I have tried several things, from heavy interlocking steel panels
covered with fabric to pcv pipe and curtains, but the best thing has
been my EZup canopy. I take the center pole out and just use the
basic 10x10 frame. You can hang curtains on the sides, but the best
thing about it is the fact that I have something from which to hang
lights (150 halogen watt with a silver rim reflector) without them
getting in the way. Over the front I hang a white valence to disguise
the metal frame - some people put a banner with their name over the
front. Once you have your jewelry display set-up, you don’t really
notice the fact that you have an EZup canopy.
Actually, the one I use for inside shows is a KD canopy because it
has better feet - I can’t use it outside because the wind blows my top
off, especially during rain storms.