Use these functions to automatically create a consistent color palette for your slides, based around a single color.
mono_accent()
The default xaringan theme with a single color used for color accents on select elements (headers, bold text, etc.).

mono_accent_inverse()
An “inverted” default xaringan theme with a single color used for color accents on select elements (headers, bold text, etc.).

These themes build from two (ideally) complementary colors.
There are also two themes based around the solarized color palette, solarized_light() and solarized_dark(). For both themes, it is advisted to change the syntax highlighting theme to solarized-light or solarized-dark (looks great paired or constrasted).