White walls are a must for Scandinavian. They make the space look bigger and brighter. With having simple walls, you can play with the rest. Since this style uses neutral color palette, you are allowed to play and mix different textures.
Whitewashed wood floors look awesome. They will add a dose of texture, as well as the fluffy rug. Keep your walls and furniture white. That leaves enough space so you can go free with the details.
Whitewashed bricks are another great way too add texture in your home. The rough look will bring visual interest into the space, breaking the monotonous white.