No, really, in Cydia, there is a Winterboarder tweak! I just don't understand what the heck it's for (it reads: "Distribution of Unix Software for iPhoneOS 3"). I'm pretty sure, though, it's not for the iPad... :D
Regardless, miss-type or not, the theming baseline is Winterboard.
Sorry, Leigh, for OTing your thread ... my bad. :o