There was a great exhibition at the Wisconsin Historical society that includes some great images- movie posters, book covers, photographs, games etc.
Link here (you can click on the images to enlarge)http://www.wisconsinhistory.org/museum/atomic/fear.asp
And, in a related note, there's a great book called Nuclear Fear, A History of Images
by Spenser R. Weart that is very compelling and definitely worth a read.
Attached is the only color photograph of the Trinity test blast.