A very very simple Blender add-on to very very quickly import images from URLs.
Just download LilyImageFromUrl.py from the last release.
A. On any image on the Internet, right click, Copy Image Address:
B. In Blender, once the add-on is installed, click on the From URL button in the UV/Image Editor.
C. And voilà!
This add-on is distributed under the terms of the GPLv3 license (see file header).
Any question is welcome either in the bug tracker or on twitter @exppad.