Love, love them. We have several varieties of various colors and growing habts here in Finland. My fondest childhood memories were of blooming crabapple trees (one tree had delicious fruits, the other one was only pretty).
They are often more cold-resistant than larger fruited Malus trees, and what people don't always know, they can be used to prepare excellent jam and fruit compott. One interesting preserve I made was pickled crabapples in vinegar/sugar, very nice indeed.
Of course these jewels can be used to make apple pie, it's wonderful with a crusty dough. A variety I liked because of it gives such a pretty red color to the filling is called Dolgo (from Russia originally I think).., they grow all over my town thanks to our municipality. (and they're freely available to all residents to enjoy)..
https://www.orangepippintrees.com/tr...ink-glow-dolgo