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Hubcap art?  Two words most people would not normally associate together, but check out this fabulous collection of hubcap metal palettes and sculptures featured on Nosh by ArtFire.  

Also, take a look at the Gallery of Metal Canvases at the LandFillArt Project, an "international effort encompassing one-thousand-forty-one (1,041) artists to claim a piece of rusted metal garbage and create fine art."