G'day (L) Mate,
Thanks for your interest. Choosing a photo may be the hardest decision of the month.
The sky's the limit, with so many to choose from. After a quick scan back over some posts in 'Dedicated Nome for Brilliant Pics', here are a few suggestions.
The Lightning, Flying Lawyer post 20th Oct 2008 (any connection with your handle ?)
Any from Old Warden Bill16STN 21st Aug 2008 (or others)
For yankee warbird enthusiasts, the Corsair over the Golden Gate, evansb 20th Mar 2009
I find a pic with clear space around the border for your desktop icons is good, as the main subject doesn't get obscured.
Maybe John Eacott who does the Rotorheads one could offer some advice. I haven't noticed a similar calendar on other forums I frequent, but maybe there is one.
All the best,
Spec.