Just click on Mutations:
http://steamcommunity.com/workshop/browse?searchtext=&childpublishedfileid=0&section=items&appid=550&browsesort=trend&requiredtags%5B%5D=Mutations

You'll get a lot of music, models etc mods. Some people just click all tags for their addons and publish it which makes it hard to find stuff you want.

May be some moderators need to be added to fix tags?!