Some ideas
- https://github.com/stereobooster/react-ideal-image/blob/master/src/components/composeStyle.js
- https://github.com/stereobooster/react-accessible-accordion/blob/styled-components/src/components/moduledComponent.js
- https://github.com/akameco/styled-style/blob/master/src/index.js
- https://github.com/css-modules/css-modules/blob/master/docs/theming.md
- https://github.com/cxs-css/cxs/blob/master/src/index.js
- https://github.com/theKashey/react-style-singleton/blob/master/src/singlentone.ts
- https://davidwalsh.name/css-variables-javascript
- ...