what makes a good window box / Basket

I think its time to do a few window boxes i have a couple done already with pansy and lobilia but what are your favourites?
My verbina is still a little small though my surfinias are rapidly getting up to size. Anyway how do you like to fill yours.
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As I've only got my kitchen windowsills for window boxes I use them in the summer for cut and come again saladings, then plant them up in the autumn with miniature daffs, iris reticulata and violas.
That is a nice idea, very near to hand. I usually have a herb trough indoors (usually in the living room my kitchen is north facing).
As my front door (only door) is south facing I try to make it look welcoming.
I should do a little project and make an arch to go round the entrance.
Either all one thing (ok, maybe two) or cram em with zillons of different things! More is more, for me. Lavenders with purple bacopa underneath is nice. I've also underplanted summer bedding with little daffs, iris retic, white muscari, and smaller alliums. All did well. I do like heuchera in trough-shaped planters, though vine weevils are a menace. I'm considering red pelargoniums with golden creeping jenny this year...
Auntie betty, I love the sound of lavender with purple bacopa