From the thread in "Christian News" - http://www.orthodoxchristianity.net/forum/index.php/topic,40435.new.html#new
The page that the thread referred to was: http://www.taday.ru/text/1245036.html
which shows images of various churches and scenes of Orthodoxy in the Transcarpathian regions.
A couple of the photos are labeled: нерукотворный крест (Cross not made by human hands).
I've never seen anything like this.
With the help of Google, it seems these crosses appear inside tree stumps. In one story a woman was cutting wood and when the log split open, it revealed the 8 pointed Orthodox Cross. http://www.nr2.ru/nn/126383.html
Has anyone heard of this before?