HeZ Holo-Vision (http://www.slexchange.com/modules.php?name=Marketplace&file=item&ItemID=602785) is a product which allows you to display your own standees and signs which always face your customer's view. No matter how many customers you have in your shop, it will appear to each and every one of them, that the Holo-Vision is looking right at them.
Holo-Vision is very easy to use. Just drop your texture into Holo-Vision's inventory, and edit the notecard to define the height and width of your hologram.
Holo-Vision uses a single prim, and works great for signs, standees, plants, lighting fixtures, and has many other uses.
Come take a look at Holo-Vision in person at the HeZ Showroom:
http://slurl.com/secondlife/Bloodlines/84/155/28