There are six basic types of harmonious colour schemes
Complementary colour schemes:
These are the colours opposite to each other in a colour wheel. They complement each other with their vast difference in contrast. Complementary colours shouldn’t be used in large amounts as they might not be as valued. This colour scheme should be implemented to make the image stand out.
Analogous colour scheme:
An analogous colour scheme is created by using adjacent colours from the colour wheel. This scheme works well because adjacent colours are similar to each other and match. This type of colour scheme is quite pleasing to the eye as the colours chosen blend together well.
Triadic colour scheme
This scheme might be a little trickier to use. One needs to choose 3 opposing colours that balance each other. A great way of using this scheme would be choosing one dominant colour and two other to balance out the main colour.
Split-complementary colour scheme
This scheme is based on three colours and is used similarly to the complementary colour scheme. To create this scheme one needs to pick the two adjacent colours to the base’s colour opposite. This scheme is pretty easy to create and is a decent option for beginners.
Rectangle (tetradic) colour scheme
The tetradic colour scheme is created from four complimentary colours arranged into pairs. This scheme enables you to have more complementing colours to work with. One should keep in mind to make sure that that there is balance between the warm and cool colours chosen.
Square colour scheme
The square colour scheme also uses four colours. It also uses 2 pairs of complementary colours but are more spaced out evenly (in the form of a square) One should also keep in mind to make sure that that there is balance between the warm and cool colours chosen.