Great questions! Monthly for sure! Templates would be best because I have to include photos of the grand kids for my parents and in-laws. Quick pages would be easier but it is sometimes hard to match up photos.
Also, there's the issue of how to present them. In the past, I have done 4x6 in landscape but I simply haven't found a 4x6 that works for me. (All the ones I have seen this year have been portrait and I simply can't find a flip frame with that orientation.) A calendar that hangs on the wall would've ideal but I am late(!) and don't want to deal with the printing hassles, unless you all have any ideas about that. Especially since I have procrastinated so long.
All that said, I think I like CD or 5x7 best since I can print those locally. For the 5x7, I would get a stand and frame. The only problem there is that we do have elderly grandparents and great grandparents who might find swapping out pictures in a frame bit of a hassle. The CD album might be easier for them to deal with. Or have any of you found a convenient way of binding calendars locally. The elderly relative issue really is a factor.
I kind of like Nettio's geometric for the simplicity of creating it and would sort of like to see some more examples of what folks have done with her templates. Bit I always love Cindy's templates too! I know they are very different styles and that makes it a tough choice.
What do you all do when you are trying to match up to quick pages? Too often, I find it hard to match photos.
I know! Need to start sooner! Stop waiting until the last moment.