I'd definitely get some flowers in there. Aside from looking good, there's the beneficial factor
A few I suggest: calendula, borage, tithonia, phacelia, bearded iris, sweet peas (the darker the colour, the better they smell on these two),
sweet alyssum, soldier poppies, cosmos, cornflowers, zinnia, honeywort, narcissus ...
Whatever flowers I grow, I go for the 'old fashioned' versions:
dwarfs, fancy coloured hybrids etc will often not have much in the way of nectar, pollen or scent.