Userpic filtering

[clioidae]

Title
Userpic filtering

Short, concise description of the idea
A suggestion for a feature that would allow the filtering of entries based on the userpic used to post it.

Full description of the idea
I suggest a filter that would allow a livejournal user to filter his or her own entries by the userpic of their selection. The user could select a userpic, just as they can select a tag, and see only those entries that displayed that pic upon posting.
An ordered list of benefits

• New and unique way to filter pages
  An interesting feature
  Something new

An ordered list of problems/issues involved

• The only thing I can think of it that it would take up your time.