Alternate background color
To change the background color of your PSP,

just change the month at the "Date
And Time" settings screen to get the indicated

background color:

January: Silver
February: Yellow/orange
March: Light Green
April: Pink
May: Green
June: Purple
July: Teal
August: Blue (like on the box)
September: Darker Purple
October: Orange
November: Brown
December: Red

Enjoy!

 Nick Simpson