Themes are being updated to suit the new GUI for Gargoyle. The currently available themes (as at latest snapshot 28/02/18)
The first set of themes can be used with Gargoyle > 1.3.16 (or thereabouts).
Themes for Gargoyle > 1.5.10
This second batch of themes can only be used with Gargoyle > 1.5.10 (after July 13, 2013) because it requires a newer gargoyle_header_footer to provide the full menu structure. Use of these themes with earlier versions of Gargoyle will not allow you to change webpages.