'Yarn-bombing' pattern developing in Orkney town of Kirkwall

Mystery knitters and crochetters have been brightening up public spaces in the Orkney town of Kirkwall with a craze known as "yarn-bombing".

Trees, railings and street signs have been decorated with colourful works.

The pair behind it are keen to protect their anonymity, and go under the alias of Knitfish and Ripples the Crocheter.

Much of their work has appeared at the public area in front of Orkney Library and Archive. The craze is believed to have originated in Texas.

Young trees are sporting crocheted cardigans, while brightly-coloured knitted tubes have been fitted around railings.

Orkney's yarn-bombers have promised to continue - as long as public opinion remains on their side.