Apple has just released iPhoto 9.1.5 and has continued its trend towards dull grey icons, which I really don’t like. So I’ve bundled up the coloured icons from 9.1.4 and simple instructions for their installation. Someday I might automate the installation, but for now it’s just a manual copy (and authenticate).
Update 2012-01-22: I’ve tested this in iPhoto 9.2.1 and it seems to be working fine.
Update 2012-05-08: I’ve tested this in iPhoto 9.2.3 and it seems to be working fine.