One well-know company which produces them is Nouvelles Images (www.nouvellesimages.com), but there are others too – e.g. IKEA does a few designs too.
I’ve come across them when I moved to the Netherlands over a year ago, as the Dutch certainly are crazy about interior design. While setting up my “temporary” home here I purchased a few of those – red poppies for my bedroom, optimistic sunflowers for the living room and elegant primula for the dining room. And you know what? They look great, they are amazing for covering up empty spaces of your wall, they do not leave any markings on the walls (and mine are white, so believe me, I would have noticed if the glue was leaving stains), are easy to remove and are a really good exercise for your imagination when you’re running around the house looking for the best place for them and deciding how you want them arranged.
Here are a few examples, and you’ll find more creative ideas on the manufacturer’s website – are you feeling inspired? I certainly wish I had more rooms and more wall to cover…