Form Tools comes with the following themes. Some of them permit fine tuning the theme via swatches - you
can learn more about themes here.
Also, see the documentation to learn about theme
Classic Grey (2.0.5)
A remodelling of the old grey-styled Form Tools 1.x theme.
Deep Blue (2.0.3)
A fixed-width blue-coloured theme designed for 1024 pixel minimum screens.
Oh Canada (2.0.2)
A red and white theme with a few maple leafs thrown in.