You can download the owl and the pussycat wallpaper for your iPhone for free from Poolga.com.
I did a little searching on the artist because I love the style very much and found her website. Catillest also known as Cat Neligan is a London based designer, with experience in digital design and illustration. She shares: ‘In my spare time I draw and paint creatures that I wish were real… Inspiration comes from 19th century children's book illustration, 1990's Nickelodeon cartoons, Eastern European stop motion animation and all work is fueled by peanut butter.'
You can find more iPhone wallpapers here.