The winning project involved a partnership between PhotoBox, web specialist Overthrow Digital and The Prince’s Foundation for Children and the Arts.

The mammoth initiative resulted in 200,000 children’s self-portraits, which had been submitted through UK schools and charities such as Mencap and Kids Company, being projected onto the front of Buckingham Palace for the Queen’s Diamond Jubilee celebrations in 2012.

Each child’s portrait was then included in an online photo-gallery, created by Photobox, from which visitors could buy mugs, t-shirts or mouse mats printed with the images. 20% of all revenue from the purchases went to The Prince’s Foundation for Children and the Arts.

PhotoBox co-founder Graham Hobson said the project, which took nine months of preparation, had been a refreshing change.

“It was great for us to do something so creative rather than just for commercial purposes. We needed to think about how to interact with children rather than our usual target audience, particularly when it came to the type of products we were offering from the online gallery,” he explained.”

Hobson said that receiving the award was a great honour and the experience had been unforgetable, not only for the children whose self-portraits were projected onto the palace, but for the staff at PhotoBox.

“It was really a proud moment for us and our families,” he added.