Consider unifying user colours with avatars

[nadonomy]

Presently we only use 3 colours to fill avatars, and 8 colours to decorate users. Should we fill avatars with the same colours? The palette may need tweaking.

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• consistent display name and avatar color

[HarHarLinks]

of course it looks good in the timeline, but it also starts to really change the look and feel of the room list, introducing a lot more visual noise:

my thoughts:

• rooms don't need to adhere to this since they're not as representative of the conversation partner (if it is only 1) as a DM
• users usually have avatars anyway?
• so do my rooms
• one could argue that it isn't noise, but recognizability by not everything sharing the same color

[robintown]

This has been done in matrix-org/matrix-react-sdk#11470