This time the winners are players Morreion and Brisbanoch. Their entries have been posted on the official LotRO forums. Morreion's screenshot is pictured here. It shows off the dynamic tree shadow effects you can enable if you're playing with a DirectX 10-ready video card in Windows Vista.
Turbine's been hosting this contest to celebrate LotRO's place as the first MMO to fully support DX10 features. It's not too late to send in an entry yourself if you've got the high-end hardware needed to support DX10 -- and if you run Windows Vista. That's a big if at this point.