Consider sending it to Change for Good, a program of UNICEF which they then use in their programs working to make children around the world healthier and happier. You can read more at
Support Change for Good by sending your leftover foreign monies to the following address:
U.S. Fund for UNICEF
ATTN: Change for Good Program
125 Maiden Lane
New York, NY 10038
As donations of foreign coins are processed in bulk by a third party vendor, so please note that the acknowledgment you receive for your donation will not specify the amount of your gift.