What is Ava's Workshop?

In Ava’s Workshop you see a set of 4 deco items. Each item consists of several blueprints. You get those from Mystery Boxes.

Once an item is complete, you can place it on your island.

Keep in mind: You have one week to place all 4 deco items on your island. Once time's up, the amount of collected blueprints (as well as not-yet placed items) will reset, and 4 new items will generate.