In The Sims 4 downloads page are two collection sets of paintings. All were made using S4S meshes, (Thank you to the Team over at S4S for including meshes in their tool!).
The Seashell Collection I made for TS4 is similar to the sets I had made for The Sims 3 and have updated that page to include the download links for those.
***Note: the frames for the above set are recolorable***
I am currently working on some other paintings and hope to have them posted in a few days.
Have a great weekend and Happy Simming!