I am currently working on redesigning a web app and want to reduce the number of colors used, especially the lot of different grey tones - warm and cool mixed up as accents for UI elements and the background.
What I want to achieve with the new color concept is to increase reliability and trustworthiness by eliminating colors that somehow don't fit in. So I came across those different versions of grey.
Is it a good idea to mix warm and cool grey tones in the UI of an application (web or desktop) and if so, how similar are they allowed to be? Especially in combination with a small set of accent colors?
Personally, I feel like it is a bad idea - as different warm/cool grey tones (both used as 'background accents' somehow don't go too well together in my aesthetics. But as a designer, I don't just want to rely on personal opinions. So, are there any rules of thumb or guidelines to follow? So far I haven't come across color schemes that include both warm and cool grey tones.