Borage grows all over my garden and allotment after I grew some from seed a few years back (it's a prolific self seeder!). The flowers are sometimes blue, sometimes pink, and sometimes pinky blue - or bluey pink, of course! It's a herb, and the flowers are edible and sweet, and the leaves give a cucumbery taste to salad or pimms - though not too many as they have a small level of a liver-toxin chemical in them.
I grow it in my tea garden as an infusion of the leaves is said to alleviate and heal colds, bronchitis, and respiratory infections, and is generally anti-inflammatory. Plus, it's good for companion planting (where you plant certain things together to aid their growth) as it attracts honeybees constantly, therefore helping them to pollinate whatever you've planted it near.
Finally - it's beautiful, cheerful, and interesting to look at! ;)