Terminal - different window colors? Here's an obscure one, it used to be that if you ...

opened a window A (say, green bg, your default)
open another window B
open prefs
change the bg color in prefs to yellow
that would change B to yellow, but leave the other one green

In this way you could fairly easily have mulitiple Terminal windows, with, different bg colors for clarity.
Unfortunately Apple fixed this bug a couple yrs ago!  Changing color in prefs now changes all open windows!
Is there any way to get different color backgrounds in Terminal when more than one window is open?

(Do note, you can set that BACKGROUND windows have low alpha (look at, strangely, the bottom of the color pane.  This doesn't help at all.  If I have four shells to four servers, I want them to have red, green, blue, yellow backgrounds. Thanks!)
You should make four shell profiles by using the duplicate option and create your shells from those different profiles.
Edit: There are other answers with alternatives that may better suit different use cases. This way is still going to be the nicest approach for consistent re-use of color sets.