And in case you upgrade to the Noble Numbat version look for my theme in line with the official grape colored wallpaper of Ubuntu 24.04 LTS from Canonical:

https://ubuntu.com/blog/the-coronation-of-a-new-mascot-noble-numbat

You can also configure the Windows taskbar to be one with the Coronation Wallpaper and my Ubuntu Noble LTS firefox theme. Using the rgb(103, 24, 71) color palette or HEX #671847.

See this: https://www.w3schools.com/colors/colors_rgb.asp