themelet
Themelet is a term used in web design and blogging communities to describe a small, focused variation of an existing theme. Unlike a full theme, a themelet is designed to be used in conjunction with a base theme, providing modest visual or behavioral changes without restructuring the entire design.
On platforms such as Tumblr, themelets were popular for allowing users to customize appearance by modifying
Development and distribution: Themelets are created by third-party designers and shared via theme marketplaces or community