Web designer Tristan White's website ColorDrop.io is a color palette website that collects some flat design colors that are commonly used. When you go to the website, you can see a series of color combinations. Clicking on the color bar will show you the code for that combination. Additionally, it has a feature that allows you to download your favorite color combinations as a txt file, so you can easily apply it to your web design. The left side of the website, "Flat Colors" allows you to see all the colors and hex color codes in a list, making it a very intuitive color selection tool.