Gitalist::Faq - Frequently asked questions about Gitalist
They don't mean anything as such,
they're just first 6 chars of the SHA-1 as a hex colour e.g the commit
#f85cb2 hence that pink colour you see.
It was an idea borrowed from Chroma-Hash (http://mattt.github.com/Chroma-Hash/).
Also at the top right hand corner of pages is the first 36 chars of the SHA-1 of the current commit where the color underneath each 6 char chunk is the corresponding hex colour.
I've found the colours to be a handy visual cue when dealing with SHA-1s.
See Gitalist for authors.
See Gitalist for the license.