Here and there are some pretty good tutorials about the subject ( even by my hand ) but the interest of the wp community is lower than it is with android.
I can upload a smal vid of my personalization just as a example. Its nothing exiting about it but just fun to do.
Root or interopunlock isnt realy necessary because there are no apps who need that.
The only thing what makes it interesting is the max apps setting ( so you can sideload numerous apps on your device ), but that was already possible when you have a sd card, so i don't need interop.
Nah not entirely true, you can do a lot more with full interop, but for the average tweaker its more than enough.
Here a small example............
And here's a link to the XDA WP section.
http://forum.xda-developers.com/windows-phone-8