Uniform nodes
The Uniform and Uniform/Grayscale node output a single uniform image whose color is configurable.

Inputs
The uniform nodes do not accept any input.
Outputs
The uniform nodes provide an output that generates a uniform color image.
Parameters
The Uniform node has a single color parameter that defines the color of the output image. The Uniform/Grayscale node has a single float parameter.
Notes
Pasting a text containing a single HTML color (in the #1234ab syntax) into a graph editor will create a Uniform node with the specified color. Pasting a list of colors will create a Colorize node instead.