[exabrial]

I think the harder you try, the more it becomes an eyesore. My favorite are Corten steel (a self protecting steel that rusts a nice natural red color) pylons personally... They just look "right" in a landscape, or at least as much as you can for humans planting wind turbines everywhere.

[scythe]

It's my understanding that weathering steels are avoided for structural applications, since while the corrosion behavior is usually pretty good, it can still be variable and unsatisfactory. There are a few high-profile cases of structures made from COR-TEN and similar that failed due to ineffective patination. It's a shame, since I agree that it does look nicer than most painted objects.

Work has continued in improving the alloy chemistry, so that it can be used for e.g. fencing without creating too many rust stains on nearby objects. One day we may be able to recreate the Delhi pillar alloy.

[31carmichael]

I agree. If you try to make a fancy design, you may draw more eyes to it, which defeats the purpose. If you really want to look at that hideous example from Hungary, you are weird. There are techniques, such as putting them halfway down, rather than on top of a ridge, to help them blend into the surroundings. But it's unlikely that you'll make them beautiful. Try, but not too hard maybe.