Muscari (Grape Hyacinth) are out in the shops right now. You should plant bulbs in autumn and LOTS of them...in which case you could do a lot worse than create a river like this one at Keukenhof (oh to see that one day).
But for those of us with a little less space, they are perfect for a container, a window-box, or any piece of glorious china you happen to have at home...just employ a bit of judicious 'plonkage' and cover any plastic pot bits with sphagnum moss. Indoors, they will go over quicker, but frankly who cares?
They are perennial bulbs, which means they'll come back year after year for you and have these tiny little urn-shaped flowers. They come in deepest cobalt, and also white and lilac (but honestly, why on earth would anyone want anything other than blue?).