Decoden refers to a trend where a person embeds various small objects, such as buttons and pearls, into the texture of a phone case. The trend originated in Japan as a way to decorate phones, but it eventually spread to other electronic devices, such as portable gaming consoles.
"Deco" in Decoden stands for "decoration," while "Den" is short for "Denwa," which means "phone" in Japanese. Initially, people crafted their own objects and made custom phone cases. Pre-made cases or tools that allow a person to decorate the case herself are readily available. The prices for pre-made phone cases on Etsy range between $25 and $75.