Wow those are nice, can't say I have a favorite because they all catch my eye. Very nicely done! Now how did you create all those effects?
I use Picasa.
On the first one its mostly bumping up the "shade" level.
The second one is mostly like it came out of the camera, with maybe a slight adjustment to color.
Third one is just switched to black and white.
Fourth one the color level is bumped way up to give it the feel of a painting.
Fifth one is switched to black and white and then "grain" is bumped up to give it an old timey photo feel.
Love them. Three is so dramatic.