The second of Nigeria's "Orders of Distinction" (as they term them) is the Order of the Niger. It was also instituted 1 October 1963 and modified in 1977. Alas I cannot find any pictures of Type 1 (1963-1977), but originally the order was awarded in four classes - Grand Commander, Commander, Officer and Member - for public service, with green and white ribbon, the pattern varying with class.
In 1977 silver and bronze medals were added, the order was split into civil and military divisions and the ribbon was changed to a red, white and green one - the same for all classes of the order, with a white edge for the medals and an additional central red stripe for the military division.
Here is a Type 2 Commander, Civil:
And a Silver Medal, also Civil: