Spectralism

Spectralism is one of many religions in the IDW Generation 1 continuity, placing great importance on colors. As Drift is one of very few practitioners we've seen, and the most prominent, information is scarce.

IDW Generation 1 Continuity

Drift's meeting with Thunderclash and thus someone who respects him is considered a "magenta moment" and blue and purple can be considered a promise to kill.

Rodimus converted to Spectralism after Skids' death and took on a blue and purple paintjob as a promise to kill him. As this is Rodimus, it's not certain how serious he is about it.