i would have carried this out via pm, but i did not know whether to address it to glenn or shadowblazer. the headers for the new themes are available as avatars. 😃
Note: the maximum size of your custom image is 150 by 150 pixels or 20000 bytes (whichever is smaller).
Glenn had to upload the new buttons during the setup phase to the avatar folders thus they will appear as avatars. If they are used as avs and show up lager than the aformentioned sizes then I'm sure they will be edited out of a members profile.
Edit: They do infact show up as large as they appear.
...but, strangely enough, I don't see a horizontal scrollbar. The forum just adjusted the text frame size and made it smaller.