They came up with three options for each project and each was voted on democratically.
"It was all about what materials we wanted to work with, what was going to look good and what techniques we have learned," arts facilitator Donna Ross told the Rotorua Daily Post.
The team made use of glass, aluminium, wood and even mannequins.
Artist Felicity Anderson focused on wood-burning skills with her "steady" hands.
"I am feeling proud," she said, looking at finished pieces this month.
Fellow artist John Harvey told the Rotorua Daily Post the artworks "were not easy" but "it was really good learning new skills" especially cutting metals.
Harvey said he loved working with Ross because "she's a really caring person".
Some St Chads artists and staff will join MPs in Wellington for the exhibition opening on July 21.
The theme is tatau tatau, enabling good lives.
Rotorua-based MP and deputy NZ First leader Fletcher Tabuteau said "the gallery there is an open opportunity for New Zealanders to display art".
He suggested St Chads' "amazing" art be featured at Parliament last year and even contributed to one of the pieces in the upcoming exhibition.
St Chads manager Nicky Mayne said any pieces which didn't sell in Wellington would be for sale later in Rotorua.
"We're hoping we won't have to bring too much back."
She thanked Tabuteau for putting St Chads' name forward.