Make color schemes. Enter the URL of an image to get a color palette that matches the image. This is useful for coming up with a website color scheme that matches a stock photo a client wants to work with www.degraeve.com.
And for you writers out there generate some interesting locations using this UK Writer's Generator. Two good sites to have in your bag of tricks. Things like this really help me on my less creative days when I am tired and just can't think.
(Thanks Jenn H. for these useful tips!)