The project is designed to improve the schools' condition and will continue until spring 2017.
Sections of the external walls at Millbank in Buckie, Applegrove in Forres, Seafield in Elgin and St Gerardine in Lossiemouth will also be rendered in each of the school colours.
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The work is being funded via a £10m grant from the Scottish Government, with the council providing the rest of the funding.
Improvement works include new roof coverings, external insulation, windows and doors.
Modern heating and electrical systems will also be installed, while the interior of the schools will be refurbished to include new classroom accommodation.
The council's head of lifelong learning, culture and sport, Graham Jarvis, said all four school will benefit from improved environments for teaching and learning once the work was completed.
(LM)
