Guild Wars 2

have bits of rocks, debris and dust fall off of edges when walking near cliffs.
and some shooting stars and comets in the sky.
and some thunder and lightning more frequently.
and lots of windy weather in the cities.
and rainbows after rainy weather.

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OT: Rainbows, and other weather-type additions would be nice. Perhaps, we will see more such things in HoT. =)

Good luck.

Night time. Give us actual dark night time with length depending on the time of the year.

varying day/night time cycle sounds interesting.