Rednose Studios has done several magazine covers, among other things. They have a blog and an online store. Their art is quirky and cute but has a deeper meaning than the first glance would show.
This would work with science because you could use this strategy with having students identify vocabulary words or even better when describing a cycle of some scientific process. Also visual patterns in words can be very important to science because knowing prefixes many words in science class can be understood without even knowing the word before hand.
I like to use prezi for presentations in science. It really allows you to get deeper into the subject material with visuals. I can use it to keep zooming in on a photo and eventually show what an "atom" looks like and the students start to understand how small they truly are!