Thanks for making this new StreetArt sub. I have listed graffiti as a good one to make, but this is broader and might accommodate more interesting content, beyond just murals and tag signs.
I was sitting on the fence about making a post but remembered this classic, Think Beauty chain link fence weaving, from over a dozen years ago repeated on sites though apparently no longer on NotCot it seems, but here are the other images I know of 2 3 4 5, perhaps collected again in one place here for the first time in a dozen years). There's no shortage of chain link fence art or fence weaving or school fence art installations on Pintrest and other crafty places.
I think this is where I may have found it, or re-found it, so long ago, as I've seen these before: http://www.bunkre.com/blog/category/art-design/ and/or https://compografo.wordpress.com/2008/04/01/tipografia-a-gran-escala/
While there's soooo much more on incredible creative fences out there, fret not, as I won't post much more like this. I can't yet be certain how open your definition for StreetArt is, but there could be so much more too: parades, street festivals, parties, costumes, buskers, sidewalk art, /s/Architecture, Googie design, Christmas lights, paper lantern (sculpture) festivals, paintings of roads, mutant cars, giant sculptures, highway billboards, Banksy, urban gardens, etc etc etc.
In 2007 we drove from Ottawa to Detroit to Memphis to Austin to the Grand Canyon to Oakland and used RoadsideAmerica.com to find all the nifty free attractions, some things even worth paying for, and sooooo many great big sculptures of things along the way and we posed like American Goth in front of them all.
My last variant on "StreetArt" for today... In the latter 1990s I used to walk everywhere in Manhattan and especially in Greenwich Village, East Village, and Loisaida (slang for Lower East Side, aka Alphabet City where I lived for years), among the many creative expressions, sculptures, and street beautifications (including a guy who added ceramic mosaics to the bases of many lampposts), there was a person who used masking tape to write elaborate phrases and quotes on the sidewalks. Despite all the foot traffic they managed to last a surprisingly long time and it was interesting to see them gradually wear away. I would thrill at finding a new one and would adjust my routines and routes accordingly to check on them. I never did learn about or stumble across who made them. Two decades before I'd ever become a "conspiracy theorist", one of his/her/their short ones is among my favourite quotes (if you can call it a quote) and it's permanently burned into my mind despite simply being masking tape on cement...
" The Universe is conspiring in your favor. "
there doesn't seem to be anything here