This is kind of an unorthodox way of creating a folder...
You can just right click on the desktop to create a new folder.

Do you want the folder to look like the folder you're getting the get-info from?

If so:
Create a new folder
do the get-info on the folder with the custom icon
select the little picture in the upper left hand corner
edit copy

do a get-info on the new folder
select the little picture in the upper left hand corner
edit paste