We love designing in neutral and pastel colours and follow up with Nordic interior design ideas, but we believe that a bit of a pattern would not hurt. You need to be very careful, if aiming to mix and match different patterns.
- Try to use patterns of multiple scale, as too much of too small pattern can make your eyes get tired very quickly
- Incorporate neutral colours. They will balance the colour scheme and add some deepness to the space. 
- And of course use colours which complement each other.