Beth Chatto's Gravel Garden. Allium Nigrum and a very wide selection of allium bulbs in the UK, try Bloms. Cool colors in a hot garden: allium Nigrum is planted with veronica 'Kapitan', stachys byzantia, and a cristophii.
Thyme is a drought resistant plant that is a beautiful shade of purple. Save water and glam up your lawn at the same time! While a little foot traffic won't hurt, you should set up a walking path through the thyme to keep from damaging the plants.