I did some small boxes for gifts last year that has 2 colors effect I got using Danish Oil.
This is red oak and Dark Danish oil.
For this project I did a quick outline cut around the area I wanted to stain because I had more unstained parts to be cut on the same piece of wood.
I stained it with a light coat of dark Danish oil. I put on a very light coat because I was worried that if it penetrated too deep into the grain the carve might not cut away all the color.
(I had this happen with pine versions of the box.)
Then I did the carve over the stained area
I finished of the whole thing with Toung Oil finish. They turned out pretty good