Give change to charity

The British Red Cross has made this very simple, by partnering with Coinstar to collect the change fed into machines at supermarkets: http://www.redcross.org.uk/Get-involved/Get-fundraising/Help-in-other-ways/Change-for-charity. But anyone outside the UK can get in on the act as well. If you have a coin jar, designate its contents for the charity of your choice. Or scrounge around in your car, bag, pockets, place-where-you-throw-all-your-international-currency, bed (but this won't work if you have a cool Spiderman-type bed that hangs from the ceiling), etc. to locate all your loose change. Take it to the bank and donate the equivalent to charity. It probably won’t be much, but if you make a habit of doing this you’ll have the satisfaction of giving away money productively without feeling any poorer, since what you’re giving away is money you didn’t even realize you had.

Effort involved: some. But surely your bank isn't too far away.