Junkin’ Around material designs

Hello again, Tabletop fam. I’m honing in some card designs and would love your thoughts.

For context, the theme of the game is junk. You’re building stuff out of junk in a junk yard. There are 7 material types, each with a different color scheme and each card is a different illustration. The yard contains 5 unique piles at a time, each pile having 1+ cards of the same material. With that in mind, which layout do y’all lean toward?