View the original community article here
Last tested: Jan 21, 2019
This Doc has the defaults.
With named_value_format, you can give it any kind of excel style formatting you want. Here's the doc that shows how to set them up and some common excel style formats.
Tip: At this time date formatting, color formatting, and hexadecimal conversion ARE NOT supported in Looker.
This content is subject to limited support.