1. Pop Out Photo Effect
Gimp tutorial

2. Let’s Start Find a picture to use
Anything works, however, people and animals work best
Create new layer, keep all settings
Rectangle tool
Select area, but make sure part of your main subject is left out of the box!
Fill the selection with white
Go to Select>Shrink
Choose around 20 pixels (this will serve as the picture border, so you may have to adjust this number)

3. Next Edit>clear Deselect
Now, choose the rectangle tool again, and draw out the entire frame Again
Choose the Perspective Tool
Depending on the picture, create perspective, making sure part of your image is on the outside of the frame
This becomes a floating layer, so click the Anchor tool (the button next to the trash can)
For now, turn down the opacity to around 60

4. More…..
Get the Eraser and erase part of the border the crosses over the actual image
Put the opacity back at 100%
Merge down the layer
Use the Scissor tool and cut out the frame and the part of the image outside of the frame (include any shadows your image may have)
Select>Invert
Edit>Cut
Deselect

5. Last Steps Get a New layer, keep all settings
Put this new layer below the previous layer
Choose the gradient blend tool
Choose a blend
Draw corner to corner
Select the top layer
Merge down
THE END!!!!