Marble - An in between color wise of Calcite and Stone by default that can be stained using dye to make Colored Marble.
Chiseled Gold, Copper and Iron Blocks: With designs that use a darker secondary color so that it can be used for floor trims or in walls, i attached an image to show roughly what im thinking, maybe calling it etched whatever would work better
Trimmed Gem Blocks: By combining a gem block with 2 gold, wrought iron, iron, or copper ingots you can get a special gem block that can pair with the new chisled blocks and colored marble to help you design full art deco areas
Wrought Iron: A dark Iron that pairs better with anvils and cauldron which will add a new block that pairs with deepslate so that you can do dark academia colorings easier, could maybe be used to make chandeliers, candle holders, bars, gate, and etc.
Patterned Carpet: Carpet with simple/deco patterns to make floors more interesting
Bordered Carpet: Think like the red carpet with like yellow on its edges to make it look fancier
Additional Paintings: Ideally in 1 by 2, 1 by 3, and 2 by 3
3 new End Woods that are muted green, muted purple, and muted blue which can add to overall interiors
Okay, I know this is a lot but i think the concept of going for this specific vibe is unique so i got excited, if you want any help with like sprite art you can reach out to me I go by MTMockTales most places so yeah..

Marble - An in between color wise of Calcite and Stone by default that can be stained using dye to make Colored Marble.
Chiseled Gold, Copper and Iron Blocks: With designs that use a darker secondary color so that it can be used for floor trims or in walls, i attached an image to show roughly what im thinking, maybe calling it etched whatever would work better
Trimmed Gem Blocks: By combining a gem block with 2 gold, wrought iron, iron, or copper ingots you can get a special gem block that can pair with the new chisled blocks and colored marble to help you design full art deco areas
Wrought Iron: A dark Iron that pairs better with anvils and cauldron which will add a new block that pairs with deepslate so that you can do dark academia colorings easier, could maybe be used to make chandeliers, candle holders, bars, gate, and etc.
Patterned Carpet: Carpet with simple/deco patterns to make floors more interesting
Bordered Carpet: Think like the red carpet with like yellow on its edges to make it look fancier
Additional Paintings: Ideally in 1 by 2, 1 by 3, and 2 by 3
3 new End Woods that are muted green, muted purple, and muted blue which can add to overall interiors
Okay, I know this is a lot but i think the concept of going for this specific vibe is unique so i got excited, if you want any help with like sprite art you can reach out to me I go by MTMockTales most places so yeah..