I did a search on "Color Pallettes" and came up with a number of sites that start with a photo either of your own or from the Internet, and then the program pulls a bunch of colors from that photo. My own computer has a "snipping tool" so I can outline anything on the screen and save it as a .jpg. I'm sure there are other ways, but some images will not let you "save". The site I tried out was bighugelabs.com. - there were many other sites, but I didn't take time to compare -- This first one was exactly what I wanted. When you get to that page, search for something like "color pallette" or similar.
Below is a favorite photo (yes, my banner) and the colors pulled from the photo. What a great quilt this would make! I could print out the photo on those fabric sheets, maybe tile it, then outline the center with blocks using the suggested colors. Yes, just like that lady who does the greeting cards with the picture and the quilt blocks that match! Too bad she already thought of it a long time ago! 8-)) (Oh brain, ya gotta turn off and finish what you have started!!!)