In case you missed it, there is a small competition going on the OTOY Octane Render forum. The 10 best architectural images, as judged by me, will each get a 100 euro voucher to spend in my HDR Sky shop.
Plus, as extra incentive, the top 3 will win a full Octane render license! So even if you don't own Octane, install the demo and get rendering!
It has been left deliberately open as 'vaguely architectural'. All you need to do to enter is post an image on the forum. I will check the forum and give feedback & encouragement, and Tom Glimps is moderating the thread. You have until THE END OF APRIL to post your entry!
Related: Read Tom's Using HDR Skies in Octane Render