Good to know about the rules for this (none, apparently)... so thought I would share a few.... (these were all done with Painter and PhotoShop).
This is actually in circulation now - done for a company that publishes western greeting and Christmas cards.
This was a cover for a national corporate in-house magazine, but it makes a fine card also.
Card for a diagnostic laboratory... they sent this to their clients (doctors)
Not to be snotty, but I am required (by the publishers) to mention that these are copyright protected. I will get in deep doo otherwise....