I planted Glory of the Snow (Chionodoxa forbesii) in the lawn to create a shimmer of blue beneath the yellow daffs. They are a native of Asia Minor where they emerge as the snow melts so they must have felt right at home in south London this year with the spring we've been having.
 This variety is called 'Blue Giant' being all of four or five inches high which is taller than the typical species. The regular bulbs are cheap as chips every autumn but these are not so common.
 They're proving to be popular with bumblebees when the sun comes out.

 NB I also included a smattering of the pink petaled variation which needless to say goes by the name of  'Pink Giant':