Feature request: Coloured Guides and/or Guide sets

I make posters which require me to create various versions for different media sizing within the same document. Instagram, facebook, print etc. 

I would be nice if within the same document I could differentiate guides for different media. So for example, I have a set of guides for instagram that I can switch on or off, then a set for facebook.

This feature, or the ability to change the color of individual guides. 

Currently I have a document with so many guides on them and it's impossible to see which guide is related to which size of the poster. 

And I don't want to create a fresh PSD for each media size as the differences between them are only slightly positional differences.