We recently re-added category colors to the community forum.
For background, these were removed with the aim of making topic lists look cleaner and more in line with RStudio's design direction. The thought was that the previous bright colors added noise and clutter for folks visiting the site for the first time.
However, many regular users -- RStudio folks, sustainers, and other who regularly visit the site --requested bringing category colors back, as they served as an important navigational tool for regular contributors. Many people are keen to see the full list of new posts, but then want to go straight to a set of categories the are most interested in helping out in. Dedicated categories colors visually separate category topics and make this navigation workflow easier. Removing colors made it harder to engage with the site in that way.
Andres and I were just in a direct message discussing what the new colors should be. We were about to start discussing borrowing colors from a continuous color pallet, and realized we open the discussion up here.
You can see all category colors here. Categories - RStudio Community
Colors for the RStudio IDE, Tidyverse, Shiny, Cloud, R Markdown are lean on hex sticker designs. I'd love to hear your suggestions.