Check out this great video on yard design.
I like atlas code 80 flex track, but the shiny black ties and the ties with the nail hole can be improved for more realism. First I cut some length off the the width of the ties. Then I cut off the ties with the nail holes.
Using a brown spray paint, I painted the bottom of the tracks, because some areas between the ties are hard for paint to reach once track is glued down.
Then I spray the top and sides. already it looks more like hardly used yard track.
I just added a little bit of grey and black to add some weathering. Now this ready for my yard. You can add more ties to fill in the gaps, But I prefer this look with weeds and cinders in the gaps.