I imagine if the sender doesn't provide a BIMI, it displays the first letter and random color as place holder.

If they bother you that much you could disable it in your account settings > webmail > hide email avatars.

Your first example pointing out the same sender having different icons is a bit weird. They do have differences, probably means they were sent by different email accounts or services. You can try aligning the names to fix it.

Those examples you pointed out

Village of Hope Maui

Village of Hope Maui Inc.

Village of Hope Maui Inc

Hey Matt, 

I ended up disabling the icons. I cant deal with that scattered "blast painting." (I had a paint can explode on a wall once, thats what it reminded me of)  Is there any way to disable the icons for the entire server all at once ?

I have confirmed that 3 different color icons came from the same email address. Yes the name was different on all 3, but the "from" address is the same.

Do you guys plan to fix this ?  The text name of the email sender should not matter, it should be based off the "from" email address if anything. Or even a way to synchronize them for a single client. OR, that we can specify what color each one shows up as.  This way we could, even if they are sending from several different from addresses, we can make all of the colors for a domain the same. All of the emails from domain "shelter people" is the same color, all of the emails from "Hawaii state government" the same color.

But just random colors creates chaos and does not actually help.

Thanks !

You can add an image to their GAL account details and it will use that icon for their avatar. You can also do it to specific contacts. 

The icon colors and monogram letter are based off the display name of the sender if they have a display name, so that would explain why they are different colors despite the address being the same. Their display names are different, you could try aligning those as well if you wanna stick to colors.