ImageCollage

ImageCollage[{image1, image2, ...}] creates a collage of images.

ImageCollage[{w1 -> image1, w2 -> image2, ...}] creates a weighted collage.

Examples

Create a simple collage:

ImageCollage[{ExampleData[{"TestImage", "Lena"}], ExampleData[{"TestImage", "Mandrill"}]}]

Weighted collage:

ImageCollage[{2 -> img1, 1 -> img2}]

Please visit the official Wolfram Language Reference for more details.