Rug color idea? Photos included.

I think a rug would look nice for my bedroom, I'm having a hard time choosing one/what size of rug. I don't really want anything crazy! (No hot pink or lime green fuzzy rugs/polka dots) lol I'm not sure if I should get a smaller one, or a larger one. This is my bedroom, the walls are off white/tan. The carpet is a greyish blue color. Any ideas would be helpful! 😊