Gutenberg contributor Andrew Serong has created a draft exploratory PR for adding opt-in, server-rendered background support for blocks, which would save background image values to the block’s style attribute in a backgroundImage key. Serong created the PR as a rough, experimental approach and published a few screenshots of how the inspector controls might fit in. However, Gutenberg designers are working on a more refined design for background support in the editor.

Today, Gutenberg designers Joen Asmussen and Javier Arce published a GitHub issue with their vision for a complete reorganization of background controls that includes layer management, layer reordering, and support for filters/blend modes.