Old/new logo usage

Hi guys, after the recent brand refresh of Gradle (introducing the Gradlephant), I am still seeing a lot of places that are still using the old gear logo - favicons, documentation, icons in this very forum, etc.

This is somewhat inconsistent and may be worth spending an afternoon on.

Furthermore, are there any guidelines who, how and under what restrictions can use it (i.e. clear space requirements, are mods allowed, etc.)? One good example for this is https://octodex.github.com/