I ground through my clip art and couldn't find anything remotely close. The first card SEEMS to be tarot -- what with the number VII in the corner, but the second one looks like it came out of an Angelina Ballerina book.
I doubt this is from an original deck - in the first draught of the script it describes the flying dolphins and the two frogs. If it were a found item I'd imagine in the script it would simply say "tarot card".
Seems more likely that it was turned over to an art department.
I have no real clue as to the dimensions. All I would do would be to size them up unitl the thumb in the image was a little larger than mine, seeing as that is Tonoi holding the card and he is HUGE. lol.
Here is a little something I worked up this afternoon. Let me know what you think. I am not going to have a lot of time for this project within the next three weeks with graduation but I am going to get it done little by little this summer.