A few months ago, I was sent a wall sticker/vinyl from Bloobry, and it was this cute pink and gold Union Jack (£25). I love it, and I finally managed to find time to put it up last week.
I think it goes really well with the pastel blue walls of one of my bedrooms. It took no more than five minutes to apply using the plastic tool that comes with it, to squeeze out any air bubbles and make sure the adhesive is stuck on firmly.
It has really lived up an otherwise plain wall, and if you aren’t keen on these colours, you are able to pick your own selection.