Tillandsia 'Sweet Isabel' is a cross between Tillandsia tectorum and T. paleacea. There is a great article on this plant on the Bromeliads in Australia site. Ive grown this plant for several years and it has not flowered yet. When it does it will have 6 inch or so purple spikes with pale lilac to white flowers.
These are small pups for sale. They are smaller than the plant in the photo.