One of the burrito joints in the city is a place called Amigo Tex-Mex, located on Washington Street. I've eaten there a few times, and they do a very nice burrito, I must say. But the reason why I'm telling you all this is that behind the restaurant, on Tobin Street, the proprietors have painted some nice pseudo-Mexican art.
There's not much to say about it, but to post the pictures so you can see them. I took them in November 2014.
Here is Amigo Tex-Mex on just-eat.ie:
This is a Wikipedia article on Mexican art:
These are some websites dealing with ancient Mexican art:
These are a couple of videos about ancient Mexico, its cultures and its art: