Metro mode

[gallery mode="metro" columns="1 / 2 / 3 / 4 / 5 / 6" first_big="true / false" ids="0001,0002,0003…n"]

Slideshow mode

[gallery mode="slideshow" width="3" height="2" ids="0001,0002,0003,0004…n"]

Default mode

[gallery columns="1 / 2 / 3 / 4 / 5 / 6…" link="file" ids="0001,0002,0003,0004…n"]