GitHub Contributions might be a bit more popular than Slack Themes. We know about 1 link to it since March 2021 and only 1 link to Slack Themes. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Check out https://slackthemes.net/ for some ideas. You can the copy paste the values to your preferences in Slack to make use of theme. Source: about 3 years ago
Funnily enough, this tool isn't new but it's been there since 2018 and you can find it at https://github-contributions.vercel.app/. Source: over 1 year ago
Sweet Themes - Color Themes for Slack
GitHub Metrics - Customize your profile with various plugins and metrics
Best Of Themes - The simplest way to browse thousands of website themes
Contributions for GitHub - Show your GitHub contributions graph on your iOS Devices
Rainglow Color Themes - 320+ color themes for a variety of editors and software.
GitWrapped - View/Share how you contributed to Github over the years