Hi
probably I was the first  to upload a skin in the OD library  "separators" category 
+ maybe  some instructions  are needed:
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"HOW TO ADD or CHANGE  the SEPARATORS"

Move the new separators in your dockbackground in use folder
(for  the single skin:  "separatorTB.png" + "separatorLR.png")
in the same folder open the dockbackground .ini file
 
1) TO ADD 
when you dont find any word  "separator" in the .ini file copy and paste the following text:

[SeparatorTop]
Image = separatorTB.png
LeftWidth = 2
TopWidth = 2
RightWidth = 2
BottomWidth = 2

[SeparatorLeft]
Image = separatorLR.png
LeftWidth = 2
TopWidth = 2
RightWidth = 2
BottomWidth = 2

[SeparatorBottom]
Image = separatorTB.png
LeftWidth = 2
TopWidth = 2
RightWidth = 2
BottomWidth = 2

[SeparatorRight]
Image = separatorLR.png
LeftWidth = 2
TopWidth = 2
RightWidth = 2
BottomWidth = 2

2) TO CHANGE
when in the dockbackground in use folder the separators alredy exists move them  in a new folder
then open the dockbackground .ini file
every time you find the word "Image" change the name after the " = "

separatorTB is for Top+Bottom
separatorLR is for Left+Right
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I hope the instructions are clear
AW this post is also to have the help from the top skinners  to improve them
thanks !!