Tools | Illustrator | Photoshop
There are a lot of excellent tools for designing color palettes: colourlovers / coolors / colormind / colorpalettes / etcetera. Some of these tools allow you to upload pics or create schemes from scratch.
I am currently working on a website for a local restaurant. The owner wants natural colors —mostly greens and browns. So I've been finding and creating food-flavored palettes. Here are are few that I love.
Avocado Seed

Green Grapes

Apple Core

Leafy Greens
