Sunny Tile

Sunny Tiles are a type of Weather Tile, which spread Sunlight. Generally, the effect of Sunlight is that it helps Flowers Bloom, unlike Shade spread by Cloudy Tile s which generally causes Flowers to wilt.

In Sunny Side Up: Cubed
In the Cubed version of the game, Suns have a range of 2 spaces.

Technically, the Cube doesn't have Tile at all. Internally, they're still referred to as Sunny Tiles however.