This is a fairly large set of modular planters and plants. Some of them are Base Game and others require specific packs but you can pick and choose what you like from the main folder in the download link below. Some of the hanging plants will actually attach to the ceiling but once you move them near a planter they will slot into it just fine.
With this mod, Sims will always be able to do the group sing and wear costume interctions. Sims will also always be able to sing together by clicking on fireworks, cakes and presentpiles.