Need to pick a color palette? coolors.co is a handy tool for generating a color palette. You can randomly generate a palette, or give it color(s) you like and it will find suitable colors to flesh out your palette.
We haven’t used it in a while, so we were pleasantly surprised to see a bunch of new features including the ability to build palettes from photographs and showing you what your palette would look like to people with different forms of color blindness. This website has really matured into quite a robust tool.