Theme Factory

This gives you 10 preset themes with matching color palettes and font pairings that you can instantly apply to any artifact Claude creates. Ocean Depths, Tech Innovation, Modern Minimalist, that sort of thing. There's a PDF showcase so you can actually see what each looks like before committing. If none of the presets work, it'll generate a custom theme on the fly based on what you describe. Honestly just saves you from the paralysis of infinite CSS tweaking when you need something that looks decent fast.