What Kevin says about it intelligent and interesting, so I'm just going to quote him.
The redesign of General Electric CFL light bulbs is aimed to bring a friendlier shelf presence through the use of basic informative graphics. An advantage of the redesign is the ability to stack the packages together to complete the graphical form of a CFL light bulb. The top and bottom of each package might look familiar, they graphically resemble what the top and bottom of a CFL light bulb. Also something to note is each wattage has it’s own color identity.
The redesign also considered the environment, the new design is packaged with post consumer cardboard rather than calm shell plastic. This ensures the use of less natural resources and therefore less impact on the environment. GE would also allow consumers to put old CFL light bulbs back in these packages and mail them back to be recycled.
If the packaging hadn't been environmentally-friendly, that would have been a huge gaffe. I love that now we're taking into account the materials we use to construct packaging, not just the design. Design and materials are seamlessly integrated here which is as it should be.