One of my responsibilities at Tether Studios was creating artwork for the web site. Every game title needed a banner and illustration that captured the essence of the game. Tether has a LOT of games, and many of them are card games which have no illustration assets save for the cards themselves. Each banner also had to be formatted so that it would work on any size screen, from mobile to extra-extra-wide, so the side pieces of each banner were infinitely repeatable. I also created the landing banner illustration and lots of “posters” for the games in different form factors.
You can see all of this in situ at TetherStudios.com.