In a previous tip you learned how decorating function parameters with a ValidateSet attribute would allow the ISE editor to display intelliSense help for the parameter arguments.
As an alternative, you can assign an enumeration data type to a parameter. Provided you pick the right data type, you wouldn't even have to put together the list of values:
function Select-Color { param( [System.ConsoleColor] $Color ) "You chose $Color" }
Once you run this code and then in the ISE, enter this, you'll see the new argument completion in action:
Select-Color -Color <-ISE opens IntelliSense menu with color values
