I agree with the random.org to choose the winners. We have had some confusion and sadness in the past. It is fair and everyone is happy with it. THat being said, anything that is fun. The grids are fun. A nice one that is recent is telling uplifting things one has done for you or you have done, something that makes life nice. I don't care much for word games, but they go pretty fast. Someone said before.......pictures are always fun. You could have us look on your site and choose something we like and link it, that is popular. Just about anything would work, like what did you have for lunch and why? LOL
good luck,
morri