HAMDEN, Conn. — Snowflakes made of coiled copy paper, Post-it notes and even Swarovski Crystal pile into a business-park office like an indoor blizzard.

They arrive by mail in envelopes and boxes. Some are dumped off by hand, others hauled in by UPS and Fed-Ex workers.

“This is bigger than Santa Claus. The volume, it’s just insane,” said Joel Krivit, property manager at Wilbur Cross Commons Business Park, as he watched people carry armloads of Frisbee-sized snowflakes into an already crowded space.

Their destination: the office of the Connecticut Parent Teacher Student Association, a nonprofit organization that comprises more than 260 parent-teacher groups in communities across the state. On Dec. 16, only two days after the Newtown shooting left 20 children and six adults dead, group leaders met with three members of Newtown’s Sandy Hook Elementary School to discuss what to do to help the surviving students.

The answer: Snowflakes for Sandy Hook.

Sandy Hook students will return to classes at Chalk Hill Middle School in neighboring Monroe. The PTSA wants to decorate the halls and classrooms of Chalk Hill, making it a “winter wonderland” to welcome the students.

So they sent out a request via media and on the group’s website, asking for snowflakes. People replied, in a big way. A flurry of letters quickly became a deluge — from such places as Haltom City, Texas, and Metairie, La.

“Words cannot begin to express how deeply sorry I am that you are going through this tragic time,” one note said.

A kindergarten teacher from San Diego wrote to say that her entire class made snowflakes for Sandy Hook students.

England, Hong Kong, Germany and most of the United States have all sent their regards. The PTSA even received some from U.S. soldiers stationed in Iraq, volunteer Michael Baldarelli said.

“It’s nice to see the whole world chipping in,” he said.