Is it possible to use custom icons on folders stored on the My Cloud? I use them a lot on my computer because they make it easier to find things. (compared to hundreds of identical-looking folder icons.)?
I have never tried this since it is not supported. Lets see what other users can share with us.
I use my own custom icons for my Music, Movies, TV Shows, Pictures with my WDTV Live Streamer.
All I do is add a a file called folder.jpg that is 180x240 pixels in size.
As for custom icons viewed from a network browser, I guess you will have to replace or change the Apahe web server default icons.
Look here /usr/share/apache2/icons
See this link for some information: http://tklaassens.wordpress.com/2011/08/15/how-to-use-custom-icons-for-directory-listing-on-a-synology-nas/
And let us know what happens.