marioepsley I know very little about meshes, I should give Jaymie's link a deep read too, but when you wanna have a basic understanding of a mesh's structure, you can use the Parabox Get Mesh Values to know more. From the output ports you can see one way of feeding the "Texture" port for a square (see composition 1).
Feeding only the texture list works fine for unlit shaders, but when you wanna shade with lit shaders etc, one should also feed the other ports it seems (see composition 2)
Or use this Add To List + Get Ranges From List method (no take from list)
I tried using Cut List instead of Get Ranges From List, but once Cut List is fed with an empty list (completely cmd-z erased), it seems the loop can't start new anymore, so you can undo the list until the first list value only (blocks first value from being erased) .