Stores that process photos from online albums have recently added a new option to the standard 4X6 or larger photo processing: photo collages. These collages are easy to make, but many photo processors charge an extra premium for them
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Make a Photo Collage on Your iPad or iPhone
Picasa comes with simple tools that let you upload your personal photos to your online photo albums.

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Upload Photos from Picasa to Picasa Web Albums and Flickr
Sharing photos on Facebook is super easy. We can upload photos from our computers, send photos from our cell phones or take photos directly from a Web cam. However, downloading the photos from Facebook is a tedious process

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Download All of Your Facebook Photos the Easy Way
Google’s Picasa is an easy-to-use yet powerful free image editor.

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How to Resize Photos in Picasa
GIMP is one of the best programs for creating a transparent background behind an image.

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Save Images with Transparency in GIMP