The Winter A-Team app is an experiment in building an accessible Windows Store app.
When the app starts, it shows 31 elements on a background image, with each element labeled from 1 to 31. When an element is invoked, a picture appears on the element. An element can only be invoked if its number is less than or equal to the current day of the month, and if all elements with lower numbers have already been invoked.
An element can be invoked in a number of different ways, as described at http://herbi.org/ATeam/WinterATeam.htm.
The app is a work in progress, and can be updated based your feedback around how it can be made more accessible.