Edit 11 May 2012 - there will be a real transit of Venus on 5/6 June although people in UK will only be able to see it very very early on the morning of 6 June (it starts at ~23h on the 5th which is no use at all!). More details here https://www.ras.org.uk/library/information-sheets/125-transits-of-venus
I don't exactly expect to win the competition (here are the rules) - maybe I'll get an honourable mention for entering into the spirit of things - but my entries might at least be unique in that they involve an orange sweet and a white pixel.
Recreating a solar transit as seen via Extreme UV Imaging, with an orange sweet, my thumb, and an actual sun ;-) http://twitpic.com/1u87cg
Original tweet: https://twitter.com/JoBrodie/status/15505285340via TweetDeck
http://twitvid.com/9A182 - The white pixel doing all the work here against a black background is in fact the ISS whooshing overhead.