I've had various ideas for things to put up in my cubicle.
Why: I'm really interested in mechanical engineering and safety engineering, and would like people to stop by and either ask what the pictures are about, or better yet if they KNOW what they're about, that they strike up a conversation with me.
Relevant to work? Yes — knowledge of engineering failures in other fields of engineering helps me do my job, because I'm more sensitive to possible catastrophic failures in the work I do. I'm also gaining experience in engineering fields outside of software engineering, and I'd like to get some recognition for that. It's not always something that people are aware of.
Note: it's important to distinguish between losses due to scattering, versus losses due to attenuation.
Charts that indicate what the CAUSE of absorbtion is:  
EM spectrum