The thing about using one colour for the whole application is that it gives off a hideous vibe.

You either use that one colour for one thing such as the headings, or use multiple colours for different things.
Or you don't use colour at all.

The thing about using one colour for the whole application is that it gives off a hideous vibe. You either use that one colour for one thing such as the headings, or use multiple colours for different things. Or you don't use colour at all.