Today (Thursday) a new system software update v3.30 for the PS Vita which will let you personalize the Start and Home screens, along with app icons and background music.
A few non-game themes will be available from the start: Crystal, Four Seasons, Stitching. Game themes featuring Uncharted: Golden Abyss, Tearaway, and Freedom Wars are on the way. Both game and non-game themes will be available for purchase on the PlayStation Store.
The update will also add Trophy rarity stats, and the ability to send event files to friends to set up game dates.