What you need:
Scrap paper
a pencil and scissors
a used envelope
markers or crayons
Method:
1. Fold the scrap paper in half. Along the fold line, draw and cut out half a medium sized heart. Open the heart and place it so its point is in on the the bottom corners of the envelope.
2. If the heart is to large for the envelope, fold the heart again and trim it. Trace the curve parts of heart ( lobes ) onto the envelope. Hold the envelope sideways and decorate it. Write on message as "I lovereading" or " I was here".
3. Cut out the heart, To use it open it and slide it over the top right-hand corner of the page you'd like to mark.