great job you guys did. I hadn't notice that there had being a change in the weekly chalenge. I only participated lately because I do not have the time to do daily photos (PAD). I actively participated in over 20 photo sites in the last five years, and ideas for challenge are really hard to get now... new ideas I mean. On every site I go, it is the same, admins need ideas for the challenge. Nothing bad about that. ideas get repeated, some branch of on themes, and people who like the themes participate regurarely but loose more generalists, some branch off into games... the next photo has an object of the preceding one or...etc ..etc.
What should be considered first, is the level of participation people can afford. The shorter the time span, the less you can do on building up your shoot. The more precise your challenge, the more time it takes for the majority to be able to produce the image. There is also the regional differences of the photographers. Obviously snow images are out of reach of a lot of people. Also there are people shots, some people don't like to be photographed, or can't photograph others because of laws.
Thankfully, this leads us to our most common denominator... our living quarters and surroundings. These do permit fast and universal shooting option. using this, we can use the same objects or situations enclosed in different variables to present a variety of challenges that can be expressed by a larger group in less time. if we take for exemple objects, let's say, cup. Obviously once you have done that, one time, you don't feel like repeats, but if we had conditions, then this might lead to some interesting situation, like briging up more ideas that could create more excellent shooting challenges. Broken cup, filled cup, empty cup, moving cup, used cup, group of cups, cute cup, ugly cup, history of a cup, danger of using a cup, fun of using a cup, cup cake, sports cups ????

, cup size !!!!

, measuring cup, cup games, cup rules, enforcement cup ...or is that cop? whaever, informative cup, stupid cup, genius cup.... I'll drink to all those.
Now I wonder what we can do with a broom....?
Just my 5¢, I'm sure you can keep the thing going for another year without my ideas...
I'm sure others will agree with me, that you have done a good job, and should win the winner's cup.