Thanks, @hungsu. For highlights, I was referring to something like GitHub - jdanielmourao/obsidian-sanctum: A minimalist theme for Obsidian, with the aim of creating a serene space of retreat, for thought and uninterrupted work. and listed as multi-colored highlights. For image grid, I was referring to something like Theme: ITS (Dark/Light Theme) - #126 by SlRvb and listed under Image Grid.
Whether either belongs with your theme, I leave to you.