How about something unique, like rupee notes with your date of birth as the currency number?
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If someone's DOB is 06/10/87, we collect all denominations from Re 1 to Rs 500—all denomination numbers will reflect 061087, which will be the DOB too.
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A Numismatist for decades having a collection of British India/Republic India Coins and Notes. When our God of Cricket Sachin Tendulkar embarked his 100th ton on 16/03/12, that was the day I started to collect unique notes which is having a unique series of numbers including the DOB format The number on the currency grabbed my attention and that lit a small idea - why can't we do a collection of currencies reflecting someone’s DOB and make Memento and gift it to our Friends/Clients & Loved ones. I started with one of my Business client and it created a buzz among my fellow clients as well. And as a result, I have a new business now.