Cards Against Humanity has a free download for a PDF to print custom cards (e.g. PDF for printing custom white cards). However, it seems that these cards are not the same shape/size as the official cards which you get when you purchase the game. The reason for this, clearly, is that while the game is offered via a creative commons-type license, so you can print your own, they want to differentiate their own version.
However, I want to print custom cards which can be used alongside the 'official' version which I own. For this to work, they need to look exactly like the other cards - at least in shape, color, card stock, and finish. That way, when such cards are mixed into the deck and we are playing, it isn't possible to tell when someone has a 'custom' card or an 'official' one.
So my question is, how should I go about printing such customer cards?
If I want to print custom cards which fit in with the regular cards which you can purchase, what card stock should I use to print them with the appropriate weight, glossy surface, etc? I have experience printing a magazine and would be happy to go to either a Kinkos or small-scale printer.