This is a great (and maybe familiar) resource from ReadWriteThink. Select your type of card (real person, idea, or more) and get started. If you are working on a Chromebook (without access to print), just save it to your drive. If you open the PDF as a Google Doc, you will get all the content but not the fancy graphic design. If you really want it to resemble a trading card, install the chrome app XODO and you will be able to open it (and then print) with the background.