This idea has the advantage that it would allow some of the prizes - particularly training materials - to end up with members of the GoW who are inexperienced and really need them, as opposed to those who are already skilled with Blender and less in need of training.
One other thing to bear in mind... There are also books available for advanced Blender users. I got "Mastering Blender" ($30) as a Christmas present, but I'm not going to start it until I finish "Blender for Dummies."
This might make a nifty first prize, with cheaper, beginner-targeted books going to other people.
http://www.amazon.com/Mastering-Blender-Tony-Mullen/dp/0470407417Another option: How about a library system? Suppose we had like three copies of "Blenders for Dummies" or "3D Textures" that people could sign up for and have loaned out to them for two months at a time?
-Collecting textures (with prizes awarded to the best submissions)
This would have to be for seamless texture collections rather than individual textures--otherwise if only eight people entered, only eight textures would be produced. Perhaps people could submit themed packs of ten like "old metal" or "sand" or "leaf."
-Collecting 3d object models (with prizes awarded to the best submissions)
Hmm... These would have to be sort of generic objects, I suppose, in order to be useful in multiple Ages.
-Collecting tutorials (text/image, or video/audio - but the best age creation tutorials fans submit would be awarded prizes)
Now this is an innovative idea.

Especially considering that most of us learn Uru-specific Age creation from the tutorials on the GoW wiki... Heek, maybe this would be the incentive I need to fix and add to my own tutorials, ehm.
