Sadly SOE has not yet enabled global colors, so there's no easy way to change stuff like font colors, has to be changed on every text element in every file. I just don't have the time to maintain another full set of files.
And yes replacing FetishStyles and Images with those from the Classic set will get you most of the way there. You'll still have blue text in many places. If you have more time than I, you could do search and replace across all the files. Most common colors are #88CCFF, #8899FF, #CCCCFF, #DDCCFF, #AADDFF, #CCDDFF, #CDCDFF.