The Orchids look great in flowerpots in your house and I love using them as a light blue dye for my bed and mixed into concrete for a light blue ceiling in my house.
And the new first favorite thing is mister Frog there to the right, who was just added into the game in the pre-release snapshots for version 1.19 which should out this summer. They come in that orangey-beige color there, green and light gray/white. But the real reason I like them is that they create a new light source block in the game and I'm rather obsessed with light source blocks.
Especially Sea Lanterns, Shroomlights and the new Froglights.