Like these:

See how there is dirt ruins? I need to learn how to do those, please help.
Do I use the fading ruins part of the bridge doodad? I tried that, didnt work.

One, you can copy/paste from that map, or any of falkoner's terrain compilation.
Two, you can use the bridge tile. Blending is a lot like a puzzle. You can also use the bottom of the ramp tile.

If you mess around with it a bit and try mirroring it and things like that you'll get the hang of it. And here you go.

If you ever need to know how I do anything I post up here, you can PM me as well.

If you are using scmdraft, you need to place the bridge doodad, then go to Edit and click "Convert to terrain." Then change to the terrain layer and change to Copy/Paste mode and select the bridge tile to copy/paste it.

Or you can just click the "include doodad tiles" button in the copy/cut/paste options