In the AWS console's top right nav bar, the Region name will be uniquely colored so you'll know what Region you're in at all times.
In the AWS Console's top right nav bar, the Region text will now be uniquely colored (based on the flag of that location) so you'll never lose track of what Region you are in!
If you'd like to look at the code, it all lives here: https://github.com/JB4GDI/awsazcolorchromeextension
And if this extension has prevented you from making a really expensive mistake, or it just made your life easier, the tip jar can be found here: https://www.paypal.me/JB4GDI
Tremendous thanks to Krakaw for making everything more efficient (no more jquery) and adding colored flags to the drop down!
There's also a favicon update pack I put together if you liked this extension, and hate that AWS uses the same favicons everywhere: https://chrome.google.com/webstore/detail/aws-favicon-update/ohloajnmmkniehhbmjakbejnomonmijc