So found the app from videos online, and have gone around getting some skins I liked installed, with a few tweaks to some, and have ultimately made a "custom" folder using all my skins and additions, to make things easy for anyone just wanting to pick up a completed collection on YL1. Most are found here in the forums, with the exception of a few skins I have taken and done things like added cut-outs, different color schemes, and lingerie, so all the major work on these skins were done by other users on this forum and you can find many other skins here in the forums.
Now for the file I post, it will contain the entire "custom" folder that you will find within your yiffalicious install (*:/Users/*/AppData/Roaming/yiffalicious.) Make sure to look for Hidden files via View. All you will need to do is take the folder and replace the current folder in the install with the one I uploaded, and you should be good to go!
Rouge the Bat Skin by MegaGarchompXY
Elaine also has an altered original skin that I created that has a transparent thong on with a cut-out and lingerie leggings.