I has the files shortcut in my sidebar forever, as i opened it it's background always went red, one day as I opened it it's Bg went yellow/orange.
Nothing else seems to have changed except by the bg color.
I`m very curious as i have never seen this happen before and no one I asked so far gave me an answer. Why did this happen? (14.04)
On top of why the colours are the way they are in this Q&A: What are the different colors on the unity launcher icons?, you received an update to the file manager icon itself, so the background changed automatically as well.
If you would want red back: the icons of all applications are located in: /usr/share/icons (and its numerous subdirectories). Just edit all the system-file-manager.png files and colour the orange drawer in red and the red background will come back.
