Style flairs you can do with core2 CSS classes

This is just a fun list of things that can be done with S2 CSS classes.

Style wide

Have a different background image for each different page type (page type classes)
Have several different layout types available (page layout classes)
Do something with the layout depending on the login status of the user (login status classes)
Do something with the layout depending on the subscription or access status of the user (subscription and access classes)
Do something with a community layout depending on the subscription (membership classes)

Make different styles for posts from personal journals, communities, or feeds on the reading page (journal type classes for entry)
Make different styles for posts with different access levels. (post security classes)
Highlight NSFW or age restricted content. (adult content classes)
Highlight posts made by the user (journal type and poster -- note, best accomplished with some S2 in the CSS)
Alternate post stylings between even and odd posts (even and odd entries)

Some flairs for entries can be taken from the recent and reading page, but entry pages also give the opportunity to:

Style public, protected, group access, and private tags differently tag visibility classes