I created some jpegs of various custom Minions as well as game aids, and had them printed by an online retailer. I am extremely disappointed with both the results and the quality.
The cards have had the content re-sized by the supplier to be about half the expected width, while a couple have thumb-print ink smudges. The supplier is customstuff.co.uk, and I cannot endorse their product at this time. They are not cheap or even inexpensive, they have no contact details on their website (not a good sign, and something I should have checked before ordering), and so there is no easy or obvious means of addressing the issue of receiving goods that are poor in quality and execution.