Someone in your family might actually enjoy these plastic novelties. My two year old has a wallet and purse that she pretends to use for "shopping around the house". When our family goes to restaurants, I usually give her my credit cards as a source of entertainment until our food arrives. My wife had a great idea of how to actually make use of all those pre-approved credit card offers that come in the mail - give them to my two year old to put in her wallet.
This way you don't have to worry about losing your real credit cards and you can make someone else in the family feel more important. It probably also could be spun as a green alternative. Of course, it’s equally as important to teach her how to use these fake credit cards wisely!