Developers use Mermaid for documentation but often lack design skills to make diagrams visually appealing.
Build a marketplace where designers can upload and sell premium Mermaid themes with consistent styling across diagram types.
SaaS teams and consultants would pay for themes that align with their brand guidelines in docs and pitches.
Launch with 3-5 high-quality themes and basic customization options.
Risk is Mermaid adding built-in theming capabilities.