I'm forum-stalking tonight.
Skincare kits sound awesome! I will almost certainly buy one.
Imho, I would love kits for a "complete look" like the Bombshell, with something for the eyes, cheeks, and lips. Maybe a natural look, with something like Model, Lovelace, and Aria/Maiden; smoky, with Storm Cloud, Raven, Maybe Baby, and Centerfold? I'm not feeling very inspired, so that's all I have. Although a kit with a bright color or two and instructions for working with it would be nice - I know a lot of people have trouble working with bright eyeshadows.
I love the little instructional eye look cards, too. They help with inspiration on those days when I can't think of anything interesting to wear.
However, I'm a sucker for kits, seriously, and I'm hopelessly addicted to SN and firmly believe your products are lovely and superior in every way. Therefore I will likely love anything you come up with.
I did just see on the V-Day thread that zeebs mentioned a vibrant mattes eyeshadow kit, which sounded interesting.
Hopefully that helps in some way, and hopefully someone else will mention something more inspired than I can come up with.