In the past I edited sprites for the Coward mod, if you are interested, I have some sprites edited by me and I can make them availableThese are edits (except Miyuki ofc) made by myself from Winter, there's no download link, at least for now.
That being said, me and another guy who has posted his own edits here before are planning to make a mod, progress is slow, but a Reverse Bunny Girl Yui costume is pretty much done by now.