Yes You can use any color, Betube offer unlimited colors options.

You just need to go 

WordPress Dashboard --> Betube Options --> Color Selection. From here you can change these colors.

a) Site Title Color: This Color will work for (meta tage: theme-color), its supported in Android Chrome

b) Primary Color

c) Secondary Color

d) Breadcrumb Background

e) Breadcrumb Text Color)

f) Vertical Slider BG

g) Sidebar V2 BG

h) Footer Background

i) Footer Heading Color

j) Footer Text Color

k) Footer Tag Background

l) Footer Bottom Background