Add a dash (small amount) of Orange to blue to get brown color. To get dark brown, keep adding little more blue until you get the shade you want. To get light brown, blue should be minimized.
What two colors make brown?
Green and red will also create brown when mixed together. To get the golden brown shade, add vary little amounts of yellow until you get the shade you wanted. Another way to get brown is by mixing violet (blue purple) and yellow. Mixing Orange with black also gives brown color. More black will give you darker shade of brown. If you also have white in your collection, adding the color into the mixture will give you a lighter brown.