Putting It Together
First thing you have to do is print all the tiles out on the cardstock. You have to print two of the cost tile sets, but they will both fit on one sheet, just turn it around after the first print. I used a color laser printer to print these. Because these will get handled a bit in the making, if you print on an inkjet printer, you will want to lightly spray each sheet with a clear coat spray (I prefer Krylon semi-gloss) before the next step so that you don't have to worry about smudging the print (during the making or later during play).
Here are the laser prints vs the inkjet (finished tiles). The colors are close either way, but the inkjet colors are not as deep or dark and when compared side by side, look slightly grayer (though you wouldn't say that if you weren't holding them side by side). I've already painted two sheets of illustrator board blue using blue and blue metallic paint. I tried to paint a fairly random coverage across the board so that it wouldn't saturate the board and so that when cutout the back of the tiles have a nice look to them. I finished them with a light spray of clear coat because otherwise the metallic spray tends to leave sparkles everywhere.