I like blue flowers, but in the 100s of perennials and shrubs in my garden, real blue is hard to find, and of course it's hard to find in orchids. This hibiscus/Rose of Sharon (cultivar unknown) by the front door is probably the bluest, but it depends on the year. The colour can vary from dark pink to purple to blue; the first blooms suggest that this is a blue season.
Early to bud out and bloom this year, and a lot of new growth. It's an older plant, and I don't know how many more years it has left. I've had it bud out as late as early August in the past; this is the earliest that I've seen flowers on it.
