Crux, cross, and plus sign patterns are bold, graphic and super clean, without fuss or bother. They are also classically Scandinavian. (In Swedish folk art the cross is a symbol of hope.) As a bonus for DIYers, they're also really easy to execute. It's doesn't get more simple than a couple of black and white lines that meet in the middle.
Here are a few great projects happening around the web:
1. A Subtle Revelry
made this simple tablecloth for a summertime pop-up bakery stand.
2. This pillow from Skona Hem
was printed using a potato stamp.
4. Mette of Monsters Circus
combined two trends into one project with these concrete paperweights.
(Images: as linked above)