The only news I've been able to find on this is reports prior to the event, such as this...
Having lost the avenue of street demonstrations, Mousavi supporters said they planned to release thousands of balloons on Friday imprinted with the message "Neda you will always remain in our hearts" -- a reference to a young woman killed last week whose image has become an icon of the protests.
From:
http://www.ibtimes.co.in/articles/20090625/iran-election-protest-ayatollah-ali-khamenei-mahmoud-ahmadinejad-neda-mousavi-oil-youtube-facebook-b_all.htmBalloons taking off:
http://www.youtube.com/watch?v=bkefKW3IIvIProtesters releasing balloons:
http://www.youtube.com/watch?v=7BYTnHVALUMSome guys trying to release a balloon but fail, maybe it's a bit too big:
http://www.youtube.com/watch?v=_ePMHUOt2ZkI'll add more vids and/or news as and when it turns up...