We have always saved our change either in the "vacation" stash or in the kids piggy banks. One year we had the kids count the pennies out and we rolled them. We have over $200. Both girls got $50 each to spend and $50 for their college savings account.
I can remember my sister saving all quarters from age 16 to 18. She ended up with $900 which paid for most of her first year college text books.
I pick up every penny too.
We used to check the pay phones back before there were cell phones. Always check the coin slots on the vending machines too.
I have a friend who each time she writes a check she write in her register the next dollar up so that it is always an even dollar amount. At the end of each month or so she checks the bank reciept and sees how much the difference is. She then transfers the difference into a savings account. I tried that once and it just messed me up so I stopped.
We opened an online savings account this year and do an automatic withdrawl monthly just like it was a bill. With only $100 taken out by vacation time we will have $1200 When we opened it we were earning 6% interest which was way more than most of our local banks. Now of course with the economy in the crapper we are only getting around 1% but still every little big adds up.
I do know of a kid who was doing one of those highway trash pick ups. She found a wad of money on the ground near a bridge. It was $800.

She turned in the serial numbers to the police department who told her after 30days if it was not claimed then it was hers. She got it. She donated half of it to two different organizations, bought herself a new outfit, and put the rest in her college savings account. We as her teachers were very proud of her.

I have also heard of the fast food restaurant money as well as those turnpike collection areas. Although I haven't gotten brave enough to do that one.