What can I do with foreign coins?

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Like a lot of people, I'll pick up a coin if I see it in the street. And lately, I've been consciously looking for dropped coins, just for a bit of fun. I even started a spreadsheet to see how much I can collect in lost change by the end of the year. Not that I've had very much look so far, people don't seem to drop coins as much as they used to. Probably because they don't carry them so much anymore, since so many people now use cards for payments. But now and again I find foreign coins in the street. Sometimes American cents, recently a Euro cent, and just today an Indian coin. What to do with them? The Euro cent's easy enough - I live in Britain, so there's every chance I'll be taking a holiday on the continent in the near future (I just need to get my next job sorted out). I'm bound to carry Euros in cash when I visit Paris or Rome, so some extra coinage might come in handy too. But what about the Indian and American currency, and anything else that might come my way? We're talking about pennies, so no chance that the bank will accept them. I have no plans to visit India, and I wouldn't try visiting the USA if you paid me. Currently circulating coins won't have any collector value, so I'm stumped. I don't just want to throw them away - throwing money in the bin feels completely unnatural, even if it is foreign. Any ideas from the assembled MyLot brains trust would be appreciated.