This is a simple editing technique, fairly common even with mobile applications. The transparency mask is at the base of a good image composite collages are just a small fraction of the possibilities they open.

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Completely clean background. A clean background may help with collages open the possibilities for further editing.
Standard editing.

Simple Collages

Simply get items closer together without the risk of overlapping white backgrounds.
Based on PNG or similar files that provide a transparency channel. Requires editing.