It's a surprisingly well established thing in the world of indie perfumes! Besides famous BPAL, I believe Seanan McGuire officially... worked with? gave her blessing to? Conjure Oils to make a line of October Daye themed ones, and I know ZOMG Smells has at least two media-themed lines, including one for Girl Genius, etc. etc. Something about the intersection of geekiness and craftiness, I guess!