One of my favourite blue flowers is Clematis 'Frances Rivis'. This alpine type clematis is one of the first to bloom in my back garden. This photo was taken in late April. I also had luck taking cuttings from it and had another plant blooming away until my dear old Saint Agatha ate it.
It blooms at the same time as many of the pink Aquilegia which makes a really pretty display. I've got several chartreuse leaved plants growing close - the blue with the vivid yellow/green is just such a tonic after a long winter.
While I've marked my seed choices in an every expanding set of catalogues, I've yet to send any in - a pleasant task for tomorrow!