Browsing the web for information on thrift-store art I came across these to resource gems.
1. Some brilliant human has a passion for collecting awkward and strange art from thrift store. She/he has a mighty collection with well over 100 pieces of art from thrift stores, junk sales, garage sales, and the like. She/he has uploaded images of all his/her paintings to their website Thriftstoreart.com.
2. Another collector of the cool Bill Davenport who is also an artist and also shares his collection online at www.billdavenport.com.
3. There is also a website dedicated to crop art: art . . . that is made . . . from crops!!!! Mind blowing! Anyway, the link is www.cropart.com.
4. A museum dedicated to those brave souls whose attempts at art were, lets say, failures: The Museum of Bad Art (MOBA). This museum is amazing. I highly encourage you to look at their collections and then read about the museum on wikipedia.org.
P.S. if you know of any related art links please share them in a comment.