Use for Clay Blocks: Clay Sifter Crafting Table
Suggestion: a crafting table called a Clay Sifter that uses Clay Blocks. There are two ways I can think of how this would be used.
1) Used to create an item called Sculpting Clay. Description: "currently an amorphous blob, but maybe if you find something phenomenal you can use this clay to recreate it..." When the player has Sculpting Clay in their hand and approaches a scene with a unique, immovable object (example: mammoth skeleton, shipwreck, etc.), they can use the action button to recreate the object. If devs don't want exact copies of those items/want a clear indicator they are recreations, they could be a scaled down version or be a single color (like gray/white). Once the clay is used like this it cannot revert back to its Sculpting Clay form.
2) Starts out with no recipes but a description of "maybe if you find something phenomenal you can recreate it here..." As the player finds different scenes with immovable objects, recipes for them appear at the table.