We have just deployed a new color picker in my presentation design tool SlideMagic. It extracts suggested colors from images. By default, it takes your logo image and offers a menu of accent colors that can be selected with one click. 

You can also select any image that is in your SlideMagic image library.

This feature had some especially stubborn and unpredictable bugs. It would work on one machine, not on another. Maybe you can check and let me know if it works (well, especially if it does not) together with your OS/browser combination that you used.

Not a user yet? You can sign up here for SlideMagic.

Apologies for infrequent posting, I am driving through beautiful South Africa at the moment. 

Art: Vincent van Gogh, The Yellow House in Arles, 1888