Showing off your love for a particular colour (in this case- blues and purples) should not require painting of walls or purchasing a new sofa. Assuming all walls and large/ expensive furniture items are of neutral colours.
With minor changes to arts, accessories and florals, you can easily achieve a new look for your space… regardless of your colour obsession.
Tip—>use mirrors to reflect colour pieces. This is good way to add more colours into a space without overcrowding.
Keep it clean and simple!
Check photos below: