Try out the Solarized colour scheme
Shuffle lane colours to reduce adjacent similarities
Add drop shadow to lanes
Close up the corner gap in lanes a bit

(it was more obvious on a HiDPI screen)
Make that shadow offset 0.5… it looks gorgeous on Hi-DPI
Increase inner radius on commit 'dot' and add shadow
Clean up shadow code a bit
Add drop shadow to refs (instead of border)
Add drop shadow to ref labels
Rounder corners on ref labels
Lighter lane shadows
Looser ref spacing
Merge branch 'refs/heads/master' into Solarized
A little more spacing between refs and commit subject
Merge branch 'refs/heads/master' into Solarized
hint
Merge branch 'refs/heads/master' into time
Merge branch 'refs/heads/time'
Tweak ref rendering a bit more