There's no limit to the colours and patterns of painted tiles, azulejos. Azul means blue, and originally most tiles were blue and white, blue colour being the cheapest.
Some tiles look 3D, some are that. Sometimes it's difficult to know which is which. The eye is easily fooled!
Yellow tiles in intense sunlight are full of energy, joy, heat, calor. There's nothing blue or sad about them. Yellow is not a blue colour.
Top: Faro, 2012
Middle: Malta, Vila do Conde, 2012
Bottom: Vila do Conde, 2013