There are 4 themes built-in to thumbsup.
mosaic
In this theme, each album is represented as a strip of small thumbnails.
See the Mosaic demo and the Mosaic documentation for more details and configuration options.
cards
This theme uses a larger layout, with one large image per album.
See the Cards demo and the Cards documentation for more details and configuration options.
classic
Each album is represented as a 2x2 square of previews.
See the Classic demo and the Classic documentation for more details and configuration options.
flow
This themes automatically arranges thumbnails in a fluid grid, mixing different sizes for a nice visual effect.
See the Flow documentation for more details and configuration options.