Gallery ships with a few Themes, some of which may be familiar to users of Text Box Decoration. I have created a few new frames especially for this Action, so you gallery can look like a gallery.
To use a theme, simply open the Themes disclosure triangle, and switch on the Use Themes check box. Now select a theme from the drop down.
NOTE: It is advised that after selecting a theme that you click on the Process Gallery button in the Actions Palette.
Themes are not supported or provided in Gallery Lite.