I had this and I lost it.
Title is called CuriousB "Break up the Concrete" (with and without base); in Grenade color.
Also under the title was "Holy Simoly concrete walls on Pooklet colors."
CuriousB recolored them, I think ?

I have a link to CuriousB's SimFileShare.

https://simfileshare.net/folder/21384/

Have looked at all of the folders and opened them but didn't see the concrete walls, does anyone know in which folder it might be ?
The site for Holy Simoly (a different site from the SFS CuriousB), has the Beige, Blue, and Gray colors, but not "Grenade" which is a light brown.
Thanks in advance.

Found it:
https://simfileshare.net/download/351602/

This is the way I did it, in case it could help somebody for future searches:
Looking at the simfileshare folder you linked, I saw that there were some GoS Event folders in there. So I thought I would try my luck with the GoS search function. I typed only the "Break up the Concrete" title you mentioned into the search bar. Among the seven search results there was one that was a perfect match:

That post had a link for CuriousB’s Break up the Concrete upload. The first picture says "Merry Christmas-in-July, Aquilegia". So I went back to the simfileshare folder you linked and searched for the term "july" using Ctrl+F, and found the one for Aquilegia.

That's it !
Thanks so much !!
Some other goodies in that upload as well.
My sims will be pleased.