Slime Block

The Slime Block can be created if your world has the Steampunker. During daytime, she will sell the Solidifier, a crafting station that turns Gel into Slime Blocks, and then into slime-themed furniture. Walking or landing on Slime Blocks produces droplet particles. There is currently speculation that Slime Blocks slightly increase spawn rate of Slimes, "akin to an invisible Slime Biome".