Rain Rot is what could be considered a Rain World 'furniture' mod, although it includes more than just decorations — some of the additions are also functional!
Rain Rot (as of writing) adds slugcat plushies, iterator plushies, paintings for each karma mural, and a handful of other things like tunnels and Pebbsi. Check out the gallery tab for a more detailed list of what's included.
In the future the mod may be expanded with more Rain-World-themed items and blocks (such as lizard plushies), however Rain Rot will never include custom mobs, world generation, or other major features — in other words, the mod will always primarily be a decoration mod, with only minor functionality on the blocks.
While tunnels can be used as decorations, they're also functional. Crouch in front of one to begin crawling!
Some blocks in Rain Rot have special interactions. For example, the Saint slug plush can be shift-right-clicked to extend its tongue.
Data pearls (by default) can be spent at these vending machines to obtain beverages.
Known for recursively transforming slugcats, these blocks can now go in your base. When powered on (using redstone), they deal damage to anything that touches them.