Not really apprentices but here's some we've played on the work-experience kids or the xmas temps in a department store:
Bags for a dyson hoover :~ (the poor lad actually spent 20 minutes looking for these till the manager found him and asked what he was doing, told him and the manager helped him look too for about 10 mins until he realised it was a wind up !!)
ink cartridges for the till receipt printer :~ doesn't use ink, it's thermolytic paper !
sky hooks :~ for putting up hanging banners
new beeps for the security gates !
cruel, but if anyone has any more for use in retail i'd love to try some!!