I have frequently been in restaurants that have containers at each table containing packets of sweeteners: the white ones contain sugar, pink is saccharin, and blue is aspartame. I happen to like the yellow stuff: sucralose itself is white, but the packets are yellow, and so I somewhat illogically call the product by the color of its packaging: the white stuff, pink stuff, blue stuff, etc.
Recently, I received an advertisement in the mail, complete with samples, for a new sweetener, Sun Crystals. The product is made by McNeil Nutritionals, whom you may recognize as the manufacturers of another sweetener, Splenda (sucralose). Sun Crystals contains both stevia and sugar cane. The advertisement brags that the Sun Crystals are "all-natural" - and that the product contains only 1 gram of carb per packet. Stevia has been around for quite a while, but it wasn't until late in 2008 that the FDA had enough information that stevia was finally termed "generally recognized as safe (GRAS)."
The color of the packet of Sun Crystal samples was green - a good marketing twist, as it's a color not yet used for other sweeteners, and green somehow fits nicely with the marketing theme that the product is "all-natural." Personally, I didn't like the bitter after-taste, which I also experienced with another stevia product I'd tried previously, but I suppose some folks won't notice it. You want to try some samples? Go to the Sun Crystal website, and fill in the form to get free samples as well as being put on their mailing list.
There are other stevia products available; Truvia, for one, also uses the green color for its packets. It doesn't have sugar cane, and hence is non-caloric.
With the marketing of Sun Crystals and Truvia, there is one more color in the sweetener rainbow:
There's an additional non-caloric sweetener that doesn't seem to have a color associated with it: Sweet One and Sunett (acesulfame-K): no calories. Websites: http://www.sweetone.com, http://www.sunett.com/
Which product to use? There are numerous criteria to help decide:
You'll have to decide which criteria are important to you. And if nothing else comes to mind, you can always choose your sweetener based on the color of the packet.