From Tonya in US:

By Ken Bushe in Dundee, Scotland:

(Click image to enlarge) (©Ken Bushe)

From Lilian Biazon in São Paulo, Brazil:

(Click images to enlarge) (© Lilian Biazon)

From Donna Levinstone in New York City, US:

(Click images to enlarge) (© Donna Levinstone)

Cloud sketches from Marcia Erickson in Raleigh, North Carolina, US:

(Click images to enlarge) (© Marcia Erickson)

From Henk Krist in The Netherlands:

(Click images to enlarge) (© Henk Krist)

From Pamela Athene Smith in Huntingdon, Cambridgeshire, UK:

(Click images to enlarge) (© Pamela Athene Smith)

From Ingeborg Stana in Oslo, Norway:

(Click images to enlarge) (© Ingeborg Stana)

From ‘a foremost graffiti artist of Albuquerque, New Mexico’, sent in by Leah Aronoff:

(Click images to enlarge) (© A foremost graffiti artist of Albuquerque, New Mexico)

From Phill Epp:

(Click images to enlarge) (© Phill Epp)

From James London-Webb, in Poole Harbour, UK:

(Click images to enlarge) (© James London-Webb)

From Debra Stroud:

(Click images to enlarge) (© Debra Stroud)

From Richard Freer in Leicester, UK:

(Click images to enlarge) (© Richard Freer)

From Elena Murer in Pisa, Italy:

(Click images to enlarge) (© Elena Murer)

From Giorgio Maria Griffa in Itlay:

(Click images to enlarge) (© Giorgio Maria Griffa)

From Stefano Sandri:

(Click images to enlarge) (© Stefano Sandri)

From Antonello Rizza in Italy:

(Click images to enlarge) (© Antonello Rizza)

From Rini Widmer in Ticino, Southern Switzerland:

(Click images to enlarge) (© Rini Widmer)

From Doug MacBean in Hamilton, Ontario, Canada:

(Click images to enlarge) (© Doug MacBean)

member 1936 in Lewes, Sussex, UK

Visit his website

From John Penfold in Co Carlow, Ireland:

(Click images to enlarge) (© John Penfold)

From Kathleen Harrington in Ohio, US:

(Click images to enlarge) (© Kathleen Harrington)

From Jan Carver:

(Click images to enlarge) (© Jan Carver)

From Jorge Fin in Murcia, Spain:

(Click images to enlarge) (© Jorge Fin)

From David A. Hardy:

(Click images to enlarge) (©David A. Hardy/astroart.org)

From Evelyn Rowland in London, UK:

(Click images to enlarge) (© Evelyn Rowland)

in Manchester, UK

Visit her website: The Art Department

From Detlev Foth in Düsseldorf, Germany:

(Click images to enlarge) (© Detlev Foth)

From Giampaolo Amstici in Trieste, Italy:

(Click images to enlarge) (© Giampaolo Amstici)

From Margaret Kahn (1921-1996), an accomplished glider pilot whose love of flying allowed her to study clouds from different angles:

(Click images to enlarge) (© Margaret Kahn)

From Kendra Larson in Portland, Oregon, US:

From Jon Watkins in Swansea, UK:

(Click images to enlarge) (© Jon Watkins)

From Malcolm Evans in Staffordshire, UK:

(Click images to enlarge) (© Malcolm Evans)