Findings:

• Blue Sky Rangers
• Beautiful Blue Sky
• Goodbye Blue Sky
• The endless blue sky is not big enough to hold her memories, so it doesn't
• blue sky revisit
• Mr. Blue Sky
• Heartless blue skies
• deep blue sky
• The Blue Sky Press
• Greyest of Blue Skies
• blue skies smile at me, blue skies inside my mind
• Blue sky with a perfect sunset
• Sky Blue (user)
• The terrifying opaqueness of a pristine blue winter sky
• SKYY Blue
• The Grass Could Turn Blue, the Sky Could Turn Green
• Blue Sky 90 (user)
• African Sky Blue
• Mr. Blue Sky (user)
• Blue Sky
• Blue Sky Martini
• Why is the sky blue?
• The significance of white jet trails against the blue/pink sky
• Crayola blue skies
• Have Blue (user)
• blue star (user)
• blue lang (user)
• Louis Blue (user)
• The Blues Brothers
• La Blue Girl
• Deep Blue
• Blue Screen of Death
• Blue Moon Rendering Tools
• Blue People
• blue
• Blue light special
• Blue Line
• big blue room
• Blue Man Group
• Blue Book
• Blue Glue
• blue goo
• Blue Velvet
• blue collar
• Blues Brothers 2000
• Blues
• Blue Meanies
• Rhythm and Blues
• Almost Blue
• Kind of Blue
• Chicago blues
• Rhapsody in Blue
• Why was Cthulhu blue?
• Pabst
• Blue Öyster Cult
• blue smoke
• Blue Note Records
• Blue Note in the Fifties
• Even Cowgirls get the Blues
• The Blue Project
• blue marlin
• Moody Blues
• Jake Blues
• Elwood Blues
• Toronto Blue Jays
• Blue Moon
• Blue Ridge Mountains
• Perfect Blue
• Blue Thunder
• Blue Nine
• Red or Blue Pill
• Blue Pill
• Blue Supergiant
• Blues Traveler
• Bobby "Blue" Bland
• Blue cohosh
• Lady Sings The Blues
• Little Boy Blue
• fizzling blue bawls
• Blue Mars
• Blue Heaven
• My Blue Heaven
• Once in a blue moon
• Blue Seed
• Blue's News
• The Blue Mask
• One Fish Two Fish Red Fish Blue Fish
• Blue Mountains
• Deep Blue Something
• methylene blue
• Blue bonnet
• Blue grass
• Blue jay
• Sevres blue
• Turnbull's blue
• twang paint run run jackson mi-sippuh blues
• Blue Harvest
• blue agave
• The Blue Danube
• Blue balls
• The Big Blue
• Blue Monday
• thin blue line
• River of Blue Fire
• Nadia: The Secret of Blue Water
• Blue Fish Antrim (user)
• Blue Wave
• Screenwriter's Blues
• I will spit the blue flame and hurl my glass against the wall
• Blues rules
• Folsom Prison Blues
• Blue Blazer
• Blue Hawaii
• Blue Lagoon
• Blue Margarita
• Blue Martini
• Blue Popper
• Blue Whale
• Blue (user)
• Jamaican Blue Mountain
• Blue murder
• Gentleman's Blues
• blue cheese
• Blue Cliff Records
• Lonesome Johnny Blues
• The Thin Blue Line
• Blue funk
• blues standard
• navy blue
• The Jon Spencer Blues Explosion
• Blue Chip
• Blue Hawthorne
• It's All Over Now, Baby Blue
• somewhere on Blue Ridge Road
• Blue's Clues
• Trembling Blue Stars
• Twelve bar blues
• Blue Rajah
• Black Tape for a Blue Girl
• 12-bar blues
• Code Blue
• blue-footed booby
• Blue Earth
• The Karner Blue
• Great Blue Heron
• Blue Man Booger (user)

If you Log in you could create a "Why is the sky blue" node. If you don't already have an account, you can register here.