You just write on the glass then use the eraser on the whiteboard marker - easy peasy!
If anyone would like me to make them one I am happy to do so, they are $12 plus postage.
Stamp sets: Papillon Potpourri, Forever young, alphabet, everything eleanor
Ink pads: primrose petals, basic black, early espresso
Cardstock: very vanilla
Punches: elegant butterfly