Reflected would mean the light isn't changed by them hitting anything like a mirror. It only alters the path of the light.
Refration is the same as passing through a prism and forming a rainbow. For example: Cut crystal chaneliers will refract light and splash rainbows on the walls.
In your case, I don't think either would be the correct word as the streamers you refer to could be due to, say, tree braches filled with leaves. At the breeze blows, they would make the streamers dance, but not necessarily sparkle or dazzle unless you're looking directly into one or there is dust in the air. If dust, this would mean sparkle as well. You could describe the scene like this:
The trees [or whatever is breaking up solid sunlight] shifted in the light breese and shafts of sunlight danced across the yard and shined brightly [or shining brightly] into our faces.
The choice is, of course, up to you.