Endless thanks to this [link]
lovely resource, which solved three hours of debate over backgrounds.
This actually began as a /lighthearted/ piece, can you believe it?
"Hatter is going to be working on something for Alice!"
"Hatter already made something for Alice, and he misses her terribly."
"Hatter is sad upon completing Alice's hat."
"Hatter can't even bear to look at the hat."
"Hatter slumps in utter depression before a hat he made for Alice, colors muted, face drawn, and with a goddamn paisley background."
I-- I think that was the progression of things.