I have seen this all over blogland and it looked easy enough, so I gave it a go.
(I always pick the easy ones haha!)
All you need is:
a frame with a glass (or even plastic) cover to write on
patterned paper of your choice
and a whiteboard marker
Just fit the paper to the size of your frame and you have an instant erase board!
Write messages on it and display it somewhere in your home :)
If you want to change it up a bit, you can change the background, erase the message and write something else!