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Substratum is an incredibly popular theming system for smartphones and tablets running compatible firmware. It has evolved from Sony's RRO framework and used to be called Layers until it evolved into the Substratum project that we know of today. We've talked about Substratum on multiple occasions here on XDA and have even produced a few tutorial videos so you can theme elements yourself. The process can seem tedious and there is some setup involved before you can get things to look the way you want.