Random images appearing in my home directory... Where are they coming from?
Solution 1:
No amount of investigation actually solved this but I did stop using Liferea and started using Lightread for reading my RSS feeds. The images stopped popping up.
Solution 2:
You can try running fatrace (see this answer) and when those images appear again, search for them in fatrace's log file. That hopefully will reveal the program that's acting up. :)