You can achieve this unique look by ordering a "gobo", which is a slide that can be customized with your wedding design. You will be surprised at how cheap this service really is-you can get one for as little as $69 at www.gobosource.com. Of course, more complex designs and materials will lead to higher costs.
Once you have your gobo, hire a lighting expert to have it projected at your wedding reception. You can have it remain static or mix things up by having the design repositioned throughout the reception. The best part about your gobo: you will be able to hold on to it forever as a keepsake of your special day...you may even want to use it at your 50th anniversary party!