Hello, my name is ray i need help with a programm or somethin?

Hello, so, here i was one day googling and youtubeing, and i saw a mate on there that had his background and it changed the color every so often and it also changes his icons collor i would love to know hoe this works and where i can get it is it a programm ? is it free :S emil me on wildlad16@hotmail.com