"Bluebird: Neat, cup shaped, woven nest of 100% fine grass or pine needles. Occasionally bits of fur or a few feathers and rootlets. Fairly deep nest cup. Eggs are powder blue, sometimes white. NOTE: Western Bluebirds will routinely add ribbons, cellophane, feathers, thin bark and leaves to their nest. Note: Rare open-cup nests were found in surface-mined lands in KY and on oak limbs in SC."
also included in the link... more pics of egg scale for the eastern bluebirds...
http://www.sialis.org/eggsizes.htm
also included in the link... more pics of egg scale for the eastern bluebirds...
http://www.sialis.org/eggsizes.htm