Using a picture as background in the filebrowser Nemo for directories which are not the home directory

im currently configuring Linux Mint Cinnamon 17 on a SSD as a Christmas present. I want to have the file-browser nemo display a .jpeg instead of a plain background in directories which should not be carelessly messed with. I just thought this would be a fun way to warn someone who's only used windows until now. Is there any way to add such a custom background? Until now I've only found out how to change the background color or font. Greetings