Sky-blue

He has a sky-blue pullover.

He has a sky-blue jumper.

Tom took the letter and tied it to a sky-blue balloon, which he then released. The balloon rose quickly, higher and higher. Soon it was hard to see, because it was sky-blue, and so was the sky, of course. Even so, Tom stood there in front of the house for a long time, gazing after the sky-blue balloon.

The checkerboard tiling and shopworn 1950s decor in Dr. David Mushabac's dental office seem a bit old fashioned, but all the necessities are there: sky-blue swivel chair with headrest, porcelain basin, cotton swabs, and row upon row of sterile metal instruments.

There are green rocks in the sky-blue box.

Except for an eye-catching sky-blue container boldly and attractively featuring the B.T.C.'s "door-to-door" arrow symbol […], there were no outlandish colour schemes or lettering styles.

[…] every petty chandler's shop will sell you Sky-blue, and every night-cellar furnish you with Holland tape, three yards a penny.