I think these are pretty wonderful. I love his overlays and use of vintage imagery and absolutely everything. See more on Mark's Flickr and his artist site, and purchase your own original screen prints from his "Make Something Cool Everyday" series on his shop.
And by the way, I think that idea is pretty great. I don't know about you, but I always try to make something cool everyday. And if I haven't made anything yet, I feel listless. Which frequently (like today) results in me adventuring to some inspiring place (like the antique shop) until my ideas aren't so scrambled.
Also by the way, I got some great new (50-60 year old) magazines for collage material. I'm psyched.