Color Painter is a tool for building wonderful color gradients on webpage.
It based on Three.js, and you can change the color scheme to whatever colors you like.
After download or clone the whole project, you don't need to install anything to run it. I recommond you to open a local server like:
python -m SimpleHTTPServer 8000
and then enter into the main path, you'll see the interface as this:
With the control panel on the right top corner, you can do some basic modification with ColorPainter:
just select some color and click 'refreshColor' button, then you can have the color scheme changed.
With the download button in the bottom of the page, you can download the image and use it anywhere you need.