I've got a thing for Dwell studio. I love their kids stuff too! Unfortunately, it's a little out my price range (unless you find their line at Target!) I just love this boys transportation collection.
I wanted to add some art work to the boys room but it can be pricey, so with the Dwell theme in mind..
I came up with these! (sorry I don't have a close up.) I just penciled on the simple outlined vehicles to some canvas I bought at Walmart and painted it in with acrylic paint. I really really like the finished product and I was able to match the colors to their room!