I'm currently doing the same code for my CardSpace presentation at WebDD this Saturday (I have five days to go, believe me this is well prepared to some presentations I've done) and I've noticed there's a lack of branding around CardSpace. One of CardSpace's advantages over, say, OpenID, is that it presents a consistent user interface in the form of the client identity selector but there are no graphics or suggested styles for login pages that utilise it.
Kim Cameron's blog uses a picture of Elastagirl and asks you to login using an "Info Card", the Microsoft CardSpace sandbox uses a gray anonymous head and calls it an "Information Card" (and incidentally doesn't work with the Firefox plugin Kevin Miller released a few weeks back). Obviously Kim's image is rather unofficial, I would hope that the bland gray head is not what Microsoft are going to push as standard branding. Without a strong, freely available to use brand users are not going to know what to expect when they press the Login / Sign In button on a site. Yes, I realise this is almost a marketing statement from me. I feel as sickened as you do, believe me.