The choice that changes all of the verbs to active voice is:
Eliza and Elliot loved the backyard playhouse that their dad, Ted, built. Eliza and Elliot gave Ted input to design the house. Ted built the house with plywood and nails. Eliza won the coin toss, so Ted painted the outside of the house pink once he had finished building its structure. Once Ted finished the outside, Eliza and Elliot decorated the inside.
This option reframes the actions so that the subjects (Eliza, Elliot, and Ted) are actively performing the verbs, rather than having actions done to them.