I just double-checked the mood theme on my journal and all of the moods seem to work fine for me, so could it be a problem with the uploaded images?

If you look at your custom mood themes page, which should be here (http://www.livejournal.com/manage/moodthemes.bml) you should be able to edit the mood theme, and then view all of the moods. For the ones that don't show up, I would suggest checking that the link to each image is correct. If the links are definitely correct, and none of the file names were changed, then I'm not sure whatelse to suggest... Maybe just try again and see if that works...