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2 HOW TO MAKE A GTK THEME THUMBNAIL?
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5 - Install ImageMagick ("apt install imagemagick")
6 - Open a terminal and run "cinnamon-preview-gtk-theme mytheme" (where mytheme is the name of the Theme you want to thumbnail)
7 - Press Alt+Print-Screen to take a screenshot of the window
8 - Go to your Pictures directory and move the screenshot to ~/screenshot.png
9 - Open a terminal and type:
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11	cd
12	convert screenshot.png -gravity north-west -extent 120x35 thumbnail.png
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14 WHICH THUMBNAIL IS USED BY CINNAMON TO REPRESENT A THEME?
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17 - Cinnamon first tries to find a gtk-3.0/thumbnail.png file in the theme directory
18 - If it doesn't find any, it looks in /usr/local/share/cinnamon/thumbnails/gtk-3.0/
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