Place the paper with the colored side down (if using colored paper). Fold the paper in half diagonally to form a triangle, then unfold to reveal a center crease.
You now have a 3D origami mouse that can sit on its own. Other "Mouse" Options
If you were looking for a , many users enjoy making origami computer mice that can be used for decoration. Easy Origami Mouse Tutorial: Origami World Tutorial Simple Paper Mouse Tutorial: Origami Mouse Instructions