blend together
To merge seamlessly and successfully with something. Each of the items being combined can be stated in the phrase. Can you blend together the ingredients for the icing while I prep the next step? Blend the butter together with the eggs.
blend into the woodwork
To make oneself inconspicuous. Because I'm on probation at work, I'm just trying to blend into the woodwork for now.
blend something together (with something)
to mix something evenly with something else. Blend the egg together with the cream. Blend the ingredients together and pour them into a baking pan.