You can reference colors in the palette by name or number in most commands that understand color names.
You can make Niagara the default palette in plots using setcolors
You can programatically access the colors using ColorTools commands
ColorTools algorithms will automatically generate new colors beyond the main 16 colors:
The Niagara palette is designed for lines, but the Lookup command can provide slightly altered shades of its colors for use in coloring points or filling regions.