A frequently updated Blockchain News collection would be cool. I know there's the Chain News badge, but the authors frequently post their own interests, not necessarily news and developments on Hive. Also, news is written about by people without the badge.
I agree with more new user collections. I was recently trying to help someone recover an old account. It took ages to find info that might be helpful.
I'm tempted to do an "art I like" collection that I'll add to when I find things I like, but it's hard for me to stick with a theme.
I love your idea of location specific collections. Since I'm a fanatic for Vietnam, maybe I'll have to start one up.