Sorry I do not have a 'photo to illustrate this suggestion but am currently experiencing problems with my Photogene Ap regarding reducing files........However as I have been working in the garden this week I have been struck by how beautiful the now flowering Euphorbia characias look together with Rosemary.
Since the Euphorbia self seed prolifically many of them, that have escaped my notice as small plants, are right in amongst the sprawling Rosemary bushes ( also in flower) and the effect, from two easy to grow plants, is stunning.