I spent sometime this morning playing with the COLOURLovers website. Wow. If you like experimenting with color, you can spend a good deal of time on this website. I think it would be really helpful for someone planning a wedding (along with decorating, floral design, you name it). Say you are struggling with which colors to use for your wedding. With this website, you can take a favorite painting, photograph, or whatever; throw it into the COLOURLovers picture palette inspiration tool; and ta-da! - the colors that were used in the picture pop up on the screen. From there, you can create a inspired color palette for your wedding.
One of my favorite paintings is the Girl in the Window by Dalí. So, I took a weblink for that painting and came up with this palette.
Check out KenzieKate's guest post on Design*Sponge for a more detailed description of how to use this website.