Can I use Game Crafter to create a prototype for playtesting purposes and fill it with art taken from the internet that I do not have the rights to? This would only be for a playtesting prototype and I would never try to sell someone else's art work without permision/payment.

Thanks for any information on this! :)

No. By reproducing it we are opening ourselves for liability. In order to continue our service and expand, we cannot afford to defend against those kinds of problems.

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Plain Black Minion

If you have to do that, then print that first prototype on your home printer only.  Then, when you make the game crafter print it, make sure you replace all the art with your own or removed art.