[fstanis]

I think what you're looking for, good as it sounds in theory, wouldn't work in practice.

There are minimal frameworks, containing e.g. just a grid. People often use one of these and then build their own components.

There are also component libraries. While they ideally aren't as opinionated as you describe (forcing you to use a specific color scheme), they still impose on you a certain philosophy and require you to use the whole library, not just individual components. Unlike e.g. Node.js where you can easily stitch together different things, UI requires consistency, both in terms of how it looks and how it's coded. Mixing different sets of components would not just be a nightmare in terms of appearance, but maintenance as well.

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All that said, you might like [Basscss](http://basscss.com). It's one of the least opinionated CSS frameworks, giving you just the "tools" part, not getting into appearance of your website at all.