Chameleon is a simple Windows Store app, designed to change the background picture of your lock screen in a defined time period (15mins, 30mins, 1hour). The free-to-use application even allows you to create your own picture channel online by selecting your preferred key words.

It searches the Internet (Google image Search and Baidu) with those key words and fills your own channel with wonderful pictures. It does not uses Bing for the same purpose.

To change the lockscreen automatically, just Left click the photo stream you want, then right click in the photo stream to bring up the options bar. You can select your options at the bottom! The description bar at the bottom appears to have been developed for mouse, it does not work with a touch screen.

All the pictures used by the application are from free and public internet services. Download Chameleon from the Windows Store.