Ever since Fedora 24 was released, I have been looking at new themes for use with Xfce that are not completely broken with GTK 3.20. I have tried several themes and since several of them had to be compiled (not copy/paste to ~/.themes), I have packaged those I have tried so far.
Here are the links to koji builds -
Arc theme github page
Arc theme koji build
Arc Red theme github page
Arc Red koji build
Adapta theme github page
Adapta theme koji build
Please email me if there are any theme requests and/or issues with these packages. Alternatively, leave comments on this page.