If you feel like the available colors are not enough, you can create your own colors and palettes!
To create a new color you need to create a new palette first. While you're coloring an image, click on the palette icon on the bottom of the screen, then tap My Palettes. Scroll left or right until you find a New Palette. Click on the empty color slots to create colors for each slot. After that, just save your palette and you'll be able to use your new colors whenever you want by opening the My Palettes option!
Please note that creating your own color and palette is limited to Colorfy Plus members.