Is there a tutorial about innstalling themes? Are thems roms that replace your current rom?
No themes do NOT replace your rom. All the theme does is make your rom all colorful and purrrty looking lol.
As for installing them, some of them you install as a zip file, so you'd boot into recovery and install it just like a rom (without wiping data or cache of course) and some are installed via metamorph. I believe all of the theme developers include instructions for installing their theme in there main post.
Hope this helps you
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