The bright fresh colours contrast beautifully with the backdrop of white. This proves the point that you don't need a huge budget to make a home an attractive place to be.
Paint everywhere white and and then visit charity shops, auctions, yard sales, car boot sales, etc. Pick up bargains, but choose carefully. Ethnic fabric shops usually have an array of colourful fabrics - rifle through the remnant bins and make cushions, throws for the backs of sofas and chairs, etc. - especially easy if you are able to sew your own. Cheap and definitely cheerful.