Heliotrope and creeping jenny in pot. Haven't tried these together, but use creeping jenny in my pots and window boxes every year. My favorite color combination for my gardens is deep purple, vibrant pink and bright yellow.
82 Creative Container Gardens: Pansies, Violas, Panolas, Grass, & Ivy - Southern Living Grass grows so easily. would be pretty in multi-layered pots. Chives would give the same look in an herb garden. Annuals mixed in with herbs might be pretty.
Go For Gold - Spectacular Container Gardening Ideas - Southern Living - These bright blooms of 'Ogon' golden sweet flag, 'Matrix Yellow Blotch' pansies, and 'Penny Clear Yellow' violas will make your pots and flowerbeds glow.