Favorite colors for paintings

Do you have favorite colors that You use in your paintings??? I do! I never new it would be these colors:

1. Oil: Paynes gray, Burnt sienna and Titanum White
2. Acrylic: Ultramarine blue, Burnt Orange and White

The last two of my paintings are excellent examples of this: 

Gallop, Oil on canvas 30x43 

Little Angel, Acrylic on canvas, 30x40

Did You notice that they give a very similar result? That grayish feel- I like to think its more sophisticated :) and I hope its not boring :D