I really like the work of Nick Butcher from Chicago, USA. The poster in my kitchen is made by him. His work is so subtle and I love how he is using color. The colorcombinations are stunning. You can buy the hand-screenprinted posters in his webshop.
The first one shown here Nick actually made in collaboration with Nadine Nakanishi.
And following some of his paintings, you can find more very inspiring paintings on his website.