I'll agree with James about Scilla bifolia. I've had it for years, although only in blue, and adore it. I'm never expecting it and then suddenly there it it is, and tiny is definitely the word for it. I've used it in a number of troughs where it seems quite happy, and can be observed closely. They are tough, and tolerate a lot of rain as long as the soil is reasonably well-drained, but seem drought-tolerant as well. Robin Hansen Southwest coast of Oregon, where it's finally raining