We are actually working on some changes that will make it much easier to blog through Hubski if you want. It's something that I have wanted to do as well. There's not too much functional difference between a personal tag and a blog, so it won't be difficult to do without much disruption. Definitely share ideas as you have them. It's little wonder about imgur's TOS. I doubt they object to the use here, as it is exactly the same as on Reddit's, but I doubt they would let Medium get away with it.
One (relatively) easy way to implement this would be to have a part on one's profile, titled something like 'My Content', which returns a list of expanded cards with posts that I want to put front and center when people visit my profile. Newest blogs/creations at the top, similar to Twitter's pinned tweets but ten times as good. Maybe even allow users to auto-fill the list by giving it a specific tag - so have My Content automatically display my 5 most recent #technology posts in (embiggened) cards.