Slack now has themes for the sidebar. If you work with multiple teams (like I do), it’s a great visual cue to avoid accidental posts to the wrong one.
I particularly like the clever implementation because it’s kind of nerdy.1
Open your user preferences in the web app:
Then bring up the sidebar theme and activate the advanced mode. Paste in a string of color codes and boom, an entirely new sidebar theme across all of your devices.
Here’s some excellent themes to consider.
Slack has always been kind of nerdy. Paste color codes into a chat and you automatically see the color swatches in the web app. ↩︎