Swear Jar every time you utter an expletive you transfer £1 to this jar. Could use IFTTT to create a swear button / icon to do this. Even better - the facility for your colleagues to trigger the transfer (still to your own pot obviously).
Lunch money every time you are paid your salary X amount is transferred to the pot which is then released slowly back into your account at a rate of Y per day (at whatever hour you set as lunchtime!)
Edit:
Flexi Jar Talking of IFTTT earlier got me thinking why not allow some user selectable options so they can create their own tailor made jar themselves.