Jason - I guess that what you're asking is what kind of card you can use that will look like the material used for commercially printed cards: the stuff that has a coated semi gloss one side and a matt uncoated on the other. Technically that's just a one side coated board, but there are specialist "greeting card" products available from your paper merchant. Typically they will have a much higher rigidity than standard coated board (to make the cards stand up properly) and will bulk much higher relative to their basis weight. So, a 240gsm board may have a thickness of 300microns. This does catch people out with digital printers as a 300gsm board may be within "spec" but in fact far too thick and stiff to reliably print on your digital machine. If you are doing a lot of these (rather than one off promotional items), it's worth (IMO) making sure that the paper complies with regulations in your country for toy & food packaging. The best advice is to speak to your paper merchants and see what they recommend, but the above "gotchas" might be of help.