Superb idea! 


So highlights would be even more useful to consolidate knowledge
Colors in Obsidian are bit overlooked right now…
Highlights and colors tell us immediately meaningful information, like
Folder category
Colored folders by @Lithou
Citation
Admonition (plugin) by @valentine.195 Notation color box (rss) by @death.au
Also, a context menu with multiple color choices to highlight selected text would be awesome… One configurable highlight is nice, but a little bit limiting