Blend: In a blender, combine blueberries, vinegar, honey, lemon, salt, and pepper.
Emulsify: With the blender running, slowly pour in oil, and continuing blending until completely emulsified and creamy, about 30 seconds.
The fresh blueberries will cause this to go bad sooner than would a simple oil and vinegar dressing. However, this is pretty acidic, so it should stay good for longer than fresh blueberries would. Safely enjoy for about 1 week.