Thinking about photos.

My office is having a thing where employees can submit artwork and photos to be hung around the office. I'm not sure if any of my photos are high-quality enough (in technical terms -- number of pixels or whatnot) to be enlarged enough to use, but I'm wondering if any of mine would be worth submitting in terms of their artistic quality.

So, my LJ audience, what do you think? Take a look at some of these and let me know if there are any you think I should submit. Note that there is overlap between various of these sets of photos.

Flickr set of nature photos
Flickr set of photos from Mexico
A photo of the Denver skyline
Photos of my grandparents' house in New Hampshire
Photos from July 4th in Boston