The StumbleUpon colors are StumbleUpon Flame, we recommend using the StumbleUpon color palette for personal projects and in the case of commercial use to visit the company website. The color codes: RGB, CYMK for print, and Hex for web HTML/CSS. StumbleUpon Official Website
Download the StumbleUpon color scheme palette image with the color hex codes as a single image. These are the suggested colors to be used for digital media.