For an interesting 3-D effect, use the Feedback tool to make an instant tunnel. Simply open any image and set it to 16.7 million colors. Go to the Image menu and choose Effects, Feedback. In the Feedback dialog box, use these settings:

• Opacity: 30%
• Intensity: 100%
• Vertical and Horizontal centers: 50%

Click OK and marvel at your "Twilight Zone" tunnel!