Zitat:XTheme allows you to change your themes with links like example.com/index.php?action=xtheme&style=themeID
Change the themeID to the ID number of the theme you want. Example IDs: 1,2,3,4,5.

This is a very simple plugin, you can see a live demo on WallBB forums(https://wallbb.co.uk).

Installation Instructions

1. Upload the content inside upload folder on your forum root.
2. Go To Admin CP > Plugins > XTheme
3. Activate the XTheme plugin

Enjoy changing your theme using simple links.

Note: XTheme is a port for MyBB 1.8 series of the mytheme plugin by Kaser for MyBB 1.6.
Full Credits to Kaser for designing this plugin.