Here are some common techniques: 1. Hue shift your complements towards the primary instead of trying to use the full range. This mimicks what we experience in

Here are some common techniques: 1. Hue shift your complements towards the primary instead of trying to use the full range. This mimicks what we experience in different lighting conditions: under a red light, everything looks red. 2. Create ramps of saturation within the palette. If you have a dark blue primary, add a grayish transition and pastels to complement. 3. Make a larger palette than you need right now and then trim it down. When making palettes for pixel art(a great way to learn color), there's an iteration between making color ramps and making test images to spot the flexibility of the palette. You can do similarly for the site design: you don't want to have tons of colors, you want colors that can be used in many different roles.