I didn't own a sugar packet holder, so I designed one and now I do!
Since the base is fairly flat I had a bit of warping when I printed this without a heated build platform. However, it still works great.
I've included the Sketchup files in case you want to tinker with it.
More details at http://makerblock.com/2010/04/new-design-sweetener-holder/

Print.
Insert sweetener packets.
Refill as needed.