Just want to share how I took this picture of the star effect of the sun.
I used the 0.6 Natural Density Filter to get the said effect. To lower the brightness, I adjusted the EV value to underexposed the sky a little bit.
The original copy had a bit of len flares, and had to clean it in the Photoshop. Alternatively you could cover the lens with your hands or cap to cast eliminate those flares, though.
You could also use Star Filter to get the star effect, but thats the easy way out. ;)
Clouds formed at the bottom of the picture is actually fogs covering Lake Geneva. No special effect done there.
This picture was taken from the Jura Mountain range near St Cergue, Switzerland.
And yes, I have to do a bit of huffing and puffing, hiking and climbing to the mountain top to be above the clouds.