Y'all weed purple, my money purple
from Kanye West (Ft. Jay-Z) – Who Gon Stop Me Lyrics on Rap Genius
Meaning
Unlike Amber Rose’s new beau, Wiz Khalifa, Kanye apparently doesn’t have time for weed. While recording Niggas in Paris Jay and Kanye are spending purple 500 Euro bills:

Ye bucks the trend in global markets toward safe haven currencies.
Purple is also the color of royalty (‘Ye has the money of a king).
Swiss thousand Franc bills are purple and are most valuable purple bill in the world:

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