I'm from Santa Cruz, California. In the mid 2000s the city started a program where they had local artists paint traffic signal boxes. It was a great way to beautify objects, create local art, and feature history, wildlife and activities local to the area. It has been very well received and has turned street corners into destinations for photos, discussion and art. It could be fun to see something like that happen here, not only in Knowledge Park but around Rock Hill.
http://www.santacruzcityarts.com/programs/graphic-traffic
Something similar was done in Rochester NY when I was living there. I really liked those and I wish they would tell a "Story". Perhaps of a local community or a landmark of Rock Hill, something that can tell stories of Rock Hill. And like you said, specially in this Snapchat/Instagram generation, they can become spots for pictures and active discussions.
I love those. Thanks for sharing.