Rain is made with mylar strings hanging down from the clouds.
String Pendant Lamp : 9 Steps (with Pictures) - Instructables
Make this whimsical cloud hanging light — a sweet addition to any kids' space
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Smile Like You Mean it: Rainbow Rain Cloud Mobile
Can a helium filled weather balloon rise up higher than a jet airplane flying at its maximum altitude? If so, why? - Quora
Death, Lies, and Destruction: The Awful Irony of Balloons
Drizzle
Cloud Shaped Foil Balloon Cute Whimsical Party Nursery Decoration Baby Shower Newborn Welcoming Gender Reveal Pregnancy Announcement
Felt 【Package Included】 1 string clouds felt wall hanging decoration, each package contains a total of 5 clouds, 1 moon, 10 stars, which can be used as an excellent background for the kids bedroom and living room. 【Size】Each clouds string approximately 5 ft long, the spacing of the clouds can be adjusted by yourself. Each cloud is 6.5 X 4.3inch, each star is 2.1 inch, and the moon is 5.1 X 5.1 inch.
Bemeet, 5ft Felt Cloud Star Wall Hanging Decoration (Set of 1) Clouds Stars Moon Wall Hanging Garland, Baby Shower Party Supplies, Sky Theme String
Robot blimps could have place in space