Your second seems to be the best, but all are still pretty begginerish.
Your Borders: Don't change the blending options of them, it makes them look tacky.Also keep the colours to black or white for the best result imo.
Your Text: If you look carefully, none of your text fits in. Everytime it looks out-of-place. This is a sign of bad text. I recommend leaving the text out completely unless it looks great and look at a few tutorials on text.
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Use of Filters: In a few of your sigs you spam filters. It's not to bad now that you're doing it as it shows you're experimenting, which is good. In the future try lay off all the filters.
That's all I got at the moment.
Your improving

Keep it up.