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.