Make sure you have sed installed. (sudo apt-get install sed)



Open a terminal in this directory; right-click-->open in terminal, or navigate to it from within the terminal.
MAKE SURE YOU ARE IN THIS DIRECTORY!

Execute the following line:

find ./ -type f \( -iname '*.svg' -o -iname '*.css' \) -exec sed -i "s/#d64937/#1a80b6/g" {} \;



#d64937 is the default accent color.

Replace #1A80B6 with the color of your choice. Restart cinnamon.
You can use rgba, hex, or standard css color names.