One of my favorite things is the free postcard scheme we have called CityCards - usually, you find them by the bathrooms in restaurants, bars, and clubs. 

Got this one during a fun night out at a local bar. Illustrations by Joelle Vanderbeke called "Whale Boat". 🐋

A teller / of stories, that is me. / Curious to learn new ways to see. / Proud dad of two. Now, what / about you? | Builds https://paragraph.xyz/@trpplffct

There's also advertising in there, but quite a lot of cards with fun quotes, random words, and art as well. May it never end.

We had something like that back in the nineties in The Netherlands called Boomerang cards. A lot of fun art cards in bars for free. Now it's only advertising.