Can be used for any online image using this simple URL structure:
https://caedmonmullin.com/portfolio/hangit/img.php?img=[IMAGE URL]&size=[PAPER SIZE AND ORIENTATION]&frameCol=[FRAME COLOUR]
Some examples:
A2 Portrait in a natural frame - Mountain Gorilla (© Toby Strong)
A1 Landscape in a black frame - lightning in Africa (© Freddie Claire)