I dont really like the background pics, colors how can i change it the background ?

load a picture go to photos and view the picture. while viewing the picture press the center touch point to bring up the picture options and select set as back ground. 

As DrLucky said, but be warned they don’t come out very clearly and you can’t disable the standard background “pattern” ie stripes etc
Also the menu icons being rather large tend to get in the way a bit and you can’t use the background whilst accessing the music functions.