This is a great idea and so effective.  It is the use of contrasting blocks or panels of colours on walls.  It was popular in the 70’s and is back in fashion.  Its an alternative to using wall paper and it’s a great way to add interest to a room with colour and pattern.  The possibilities are endless.  Geometric patterns are very popular.  You can make it as bold or as subtle as you like.  It is a great way to add interest to a room without chewing into that budget. 

Here are some ideas.