|Benchak the Nightstalker Contributor, RPG Superstar 2010 Top 8|
prestigitation is a spell like ability which would require a standard action and activating a magic item is also a standard action. Regardless of the fluff reasons it is not possible without manipulating the item magic via a quickened spell or ability.
All other things allowing, prestidigitation would work fine, despite the standard action cast time. It has a duration of 1 hour.