We have stained concrete floors in the kitchen and family room of our house. they are two different colors. I am trying to find a way to separate the two, some sort of threshold or division (paint, tile, etc...) does anyone have any ideas? Thank you!

I think I would go with a painted line just to keep from adding the height of any threshold as a trip hazard. A fairly thin stripe of a contrasting color to both floors should do it.