The history behind the headers you can find in Twenty Ten for WordPress 3.0 is quite an interesting read actually, who would have thought Matt Mullenweg took them from his travels around the world? If you had the chance, would you have included any others? 
I’d be interested in seeing people come up with header image addon packs for it. The images added about 400K to the WP zip, so I would not have been in favor of adding more in the WP distro.
Funny you should mention that Ron, after I switched the PC off last night and headed to bed, I thought the exact same thing while trying to get to sleep!
And yes I do agree, if we didn’t take into account the file size(s) though?