Came across the online software when visited one of the students' site. This is an accidental surprise, as I would have gone for the simplest means, insert the images in a powerpoint slide and convert it to an image. Didn't expect any online stuff. The website is http://www.shapecollage.com/
Nevertheless, it's interesting as it could organise/re-arrangment the images in various ways!
and can extract images conveniently from online albums! So convenient.
Here are some of my masterpieces...
Can also find here: http://www.shapecollage.com/online/?cid=czhe8u8a