My gift to the eight people still using Quartz Composer. May your patches be forever tidy. Amen.
- Download the icon PNG.
- Open it in Preview, select all (⌘A), copy (⌘C).
- Find Quartz Composer in Finder, highlight it and Get Info (⌘I).
- Highlight the QC icon in the upper-left corner, paste (⌘V).
Still confused? This video might help.