OK, Last night I did this. I installed MyColors, allowed it to install all my myColors themes. Do not apply any. If you do, you may have to reinstall WindowBlinds afterward. Actually, you'll end up reinstalling WindowBlinds anyway. But trust me, don't run a MyColors theme from MyColors.
Then I went into the theme manager directory(C:\Users\Public\Documents\Stardock\ThemeManager), and grabbed all the xxxxxx.mycolors files.
I copied them into another folder. Extracted them with 7zip.
This results in a folder containing the icons, windowblind, and other files.
Inside the windowblind folder,you'll have a folder named after the WB. In it you have encoded graphics. Here's the tricky part.
Go back to the directory (C:\Users\Public\Documents\Stardock\ThemeManager), and copy the xxx.bin files for each WB into the respective folder for their WB where you extracted them earlier. zip them, and change the extension to .wba. Then double click to install into WindowBlinds.
Example, put the Magic bin file into the Magic WB folder that has encoded gfx, zip it, change extension to .wba, double click it. Voila, you have your unencoded WB installed!
The .bin file is what unencodes them so you can install and use via windowblinds.
Be sure to place the bin file it the folder that is labeled with the same name as the WB. Not into the folder labeled windowblinds, in your extracted folders.
I hope this is clear, it reads a bit confused, but it worked for me.
I assume that my posting this is ok, since my assumption is that you'd have to own the content in order to have access to the .bin files.
If I assume incorrectly, please delete this moderators, and know I was only trying to help.