Found on tumblr. Marking as NSFW for obvious reasons :P
EDIT: PHEW. updated link b/c I thought blog was deleted but the artist just changed their username which also changes the url on tumblr so I thought they'd nuked their account
Oh, ha, sorry :P
I only have my blue filters set for after 2100 so it didn't register to me but yeah I can see where the colors would turn.
I think most fans nowadays avoid drawing Blake with darker skin because of the obvious connotations it brings (I think it may have caused a few fandom kerfluffles in the past) but I'm not unused to seeing it in all my archive-diving so it didn't even register to me.