Web without colors ? Am I watching a black and white movie ? There are plenty of ways you can use colors. Most of the web UI designers have the palettes.
Codies like me always love to have minimal editors like VSCode / Atom / Sublim. There are plenty of website offer variety of palletes and gradient map.
One of my favorite is UI Gradient which let me choose between colors and gradients and simply copy the css to my web app .
The others in my list offer cool cool palettes and Canva is another favorite of mine