During the Forum update for our Student Hall, I also installed three new styles to choose from!
You can change your styles in the User Control Panel which you find under your name in the top right corner of the regular style. Click your name and then a menu will unfold. Choose User Control Panel, then Board preferences and then you can set your preferred board style by choosing one from the drop down menu. Once you hit submit AND clicked return to user control panel, your style will be updated. You can switch at any time, to your hearts content!