NOTE: Artworks shown below are not known to have a direct relation to particular game installments of the Mario series. Some were featured at specific events that Nintendo was involved with, while others have been used for various purposes by Nintendo.
A relationship advice image posted on Nintendo's Facebook page in February 2013, telling others to take a tip from Princess Peach and bake their "sweetheart" a cake
Graphic showing various appearances of Princess Peach and Mario, posted on Nintendo's Facebook page on Valentine's Day 2014
Princess Peach (promotional art for the New Nintendo 3DS "Kisekae Plate" covers)