To generate and display a unique image for each iteration of a loop, you can use a programming language that supports image manipulation, such as Python with the Pillow library.

Here's an example Python code that generates and displays a unique image for each iteration of a loop: 

from PIL import Image, ImageDraw
import random

# Define the size of the image
width = 200
height = 200

# Loop through a range of iterations
for i in range(10):
    # Create a new blank image
    image = Image.new('RGB', (width, height), color = 'white')
    
    # Draw a random shape on the image
    draw = ImageDraw.Draw(image)
    shape = random.choice(['circle', 'rectangle', 'triangle'])
    if shape == 'circle':
        draw.ellipse((50, 50, 150, 150), fill='blue')
    elif shape == 'rectangle':
        draw.rectangle((50, 50, 150, 150), fill='red')
    elif shape == 'triangle':
        draw.polygon([(100, 50), (50, 150), (150, 150)], fill='green')
    
    # Display the image
    image.show()

In this code, we first define the size of the image to be generated. Then we loop through a range of iterations (in this case, 10). For each iteration, we create a new blank image using the Image.new() method. We then draw a random shape on the image using the ImageDraw module, and display the image using the show() method.

You can customize this code to generate different types of images or shapes for each iteration, depending on your needs.