Very nice sigs. Also one thing you could improve your sigs would be to distinguish your text from the background. The clouds in #1 are kind of distracting, the second one is pretty good, the third one's text needs to be more defined (a different color such as red would be nice) and the fourth one is solid.
The first on it ok but i like the one more to thje bottom take out the first one and you would get a better score but with it in i have to give you a a over all score of 8/10 enjoy