Well,
I have worked a lot on the Skin Mixer with internal updates and I published a new apk that you will found on te dedicated page, the version apk and the updated stuff.
The next update, I will work on an activity where you will find all your generated skins to modify or delete them. Then I will work a lot on the Preview of the skins.
For the moment, there is a little problem with beautiful widgets not refreshing the new skins but it will be fixed soon 