The ceiling at our venue is just an old drop ceiling, its turned yellow from years of the A/C vents running across it, and I really want to cover it. What would be the best fabric to cover this with. Tulle seems like it would be too thin, but anything solid would block out all the light... oh yeah I would like to use this to also dim down a bit of the lights as the ones there are just florescent lights, and tend to be brighter. Any suggestions?