I have a clematis for shade that does well with just a little dappled sun. It's a nice splash of color for the area, and mine blooms as long as the weather stays warm.
It's been a challenge for me to get things to grow in my shady spots, too. Everything needs a little sun once in a while. I have a lot of "deep shade" spots where not much grows at all -- even moss has a hard time!
When I found a shade loving clematis, I was really pleased because I couldn’t believe it would grow as well as it did with no more sunlight than it got. I’d recommend it.