Sadly, I'm kidding about the mochi balls. The IKEA manga sheets are a real thing, though.
The Swedish artist (and workout for the site's special text support) Åsa Ekström was commissioned by the flatpack furnishing giant to design a series of fabrics around the theme of "Scandinavia meets Japan," to be displayed and sold in IKEA department stores worldwide.
The results were dubbed the "CHARLOTTA" collection, which include bedsheets featuring stylized Vikings, origami animals, and famous Scandinavian buildings being demolished by Godzilla. On balance they don't look half as bad as one might have imagined they could turn out. The patterns certainly don't look as embarrassing as, say, a Street Fighter blanket.