Uhm, it's not really what I like, but w/e, who cares
How to make a border.
Step 1:
Make a new layer, and put on top of the list.
Step 2:
Press "Ctrl+A" to select everything inside the layer(if it's ok there shouldn't be anything, so it will select only the borders of the sig)
Step 3:
Go to:
Edit----> Stroke
Step 4:
Now get a color you like(Most people pref. black, but I take something from the sig's main color) using the pipet tool(Will show up the second you move your mouse outside the "stroke window").
Set the mode to "Inside", and press OK.
Et voilà!
EDIT: Typo's FTL
