Hey Christina Peschong ,
There are certainly many ways to go about implementing a Photo of the Day sort of widget.
I think before we decide on how to implement it there are few questions we should ask.
1) Where will you be getting the images?
2) Will there be a predefined set of images or random selection for pool of images everyday?
3) How flexible do you want to be with how this looks etc.
To me, I think we should start there. But if I were to pick one I think is the easiest to implement (blog, microblog...) I would say I would look at the blog implementation first, and if I need to get really detailed, I would look at building my own widget.
I hope this helped point you in the right direction.
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