These official Stardew Valley stickers were designed by—please be patient, it's a long list—Tony Kuchar, Ian Wilding, Chihiro Sakaida, Audrey Waner, Yesica Furrow, Nina Matsumoto, Jon Kay, Amanda Johnson, Kaori Takizawa, Laura Verdin, and Kari Fry. 

They come on two sticker sheets; each sheet is about 15x20 cm.