And then looking further I saw this : <a href="http:&#x2F;&#x2F;www.wvshare.com&#x2F;product&#x2F;4.3inch-e-Paper.htm" rel="nofollow">http:&#x2F;&#x2F;www.wvshare.com&#x2F;product&#x2F;4.3inch-e-Paper.htm</a> now there is a hack-a-day worthy project. 42 of those bad boys (just $250 including shipping!) and a frame and clever raspi software with a multiplexing serial I&#x2F;O circuit and voila, the forever calendar for your wall.