My first attempt to create a customized brush in Procreate, one of the most popular and fun painting apps on iPad. It took a while to experiment with and create the strokes and effects I want, and I am sharing my work with you:
It lays down a smooth flow of colors with 38-degree oblique point, and by varying pressure you'll see color transition between primary and secondary colors.
Use it in your work or build your next brush with it, whatever you want. Enjoy!