I saw this posted on the DIY board and wanted to share. These are frames from IKEA:http://www.ikea.com/us/en/catalog/products/30151035
which are two sided. Some stores have them prices for $1.99, but the website has them listed at $0.99. If you print the web page they will honor the price (so I've heard)
Here is a template for them as well:http://ruffledblog.com/2010/02/wedding-menu-template/
If you want to change the color, you can spray paint them with a spray paint for plastic which you can pick up at your local Home Depot.
Unfortunately, I've already started working on our table # holders or I would definitely do this, but thought this might come in handy for someone.