Although the article linked below is written for Ed's backyard - Colorado - his comments and information are apropos for matching and fishing the early spring blue-winged olive hatches anywhere in the continental U.S.
Remember that the fishing action really begins when the blue-winged olive nymphs, which are good swimmers, make their way from the stream bottom to the surface where they will emerge from the nymphal shuck as winged, air-breathing adults. Look for blue-winged olive emerger patterns in sizes 18-22 that utilize flashy synthetics such as Mylar, Krystal Flash, Antron or silver-lined glass beads. Besides giving the impression of movement and action, the flashy stuff also imitates the bright air bubble associated with a nymph as it heads toward the water's surface or as it begins to extricate itself from the shuck.
Link: Ed Engle: Spring winds delay the fly-fishing season - Boulder Daily Camera
I have recently tied up some emergers with the silver-lined glass beads after he showed his technique for them at one of the winter fly fishing shows. I'll post a photo when I get chance.
Some great information from one of the guys in our sport that speaks softly and should always be listened to. I learn something from Ed everytime I talk to him, and he usually good for a laugh or two as well.
Get out and fish!