In the [Graffiti tutorial](http://ocsigen.org/tuto/6.1/manual/application), the part *Color and size of the brush* is based on the [ocsigen-widgets](https://github.com/ocsigen/ocsigen-widgets) which are deprecated. The README of the repo links to [ocsigen-toolkit](https://github.com/ocsigen/ocsigen-toolkit). Is there a color picker widget in ocsigen-toolkit ?