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Inspired by the "LEGO® Bricks And Paper" collaboration with Muji ( http://www.muji.com/lego/ ), this is a noteboard that uses LEGO bricks to hold in place notes written on paper with stud-sized holes punched in it. (This paper supply could be restocked at LEGO or Muji stores, or created by the user with the Muji hole punch and stencil and standard paper note squares).
It is comprised of a wooden frame with trays at the bottom to store the paper and bricks required and a baseplate-like sheet of studs to attach the bricks to. Using 2x2 bricks as fasteners allows for easy removal of the notes and a wide variety of colours (which could form a colour code system that identifies different notes, for example).
The product could come in different sizes and could be marketed at families (for a kitchen noticeboard etc), children (to have notes in their room) or even businesspeople (to brighten up otherwise dull office spaces). The boards could obviously be personalised with other LEGO pieces and minifigures or divided into sections with bricks or tiles.