The EMC promotional video showcased a few of the grand builds on a couple of the servers... maybe you could do a video of some of the shops, or maybe some of the wilderness settlements as it seems there are more and more of them.
Shops and town builds are already over used in EMC videos, so I would be kicking a dead horse with that.
I have made a few, and will make more. Idea's will come just keep thinking about them and how to make them interesting, or different as Alex said original. If you think too hard about it though you might never do them so give it ago and you will improve in time. Just don't expect to much from them, it takes time to build up a good supportive audience. All the best with them