Earlier, Steve thinks. And he has no idea how to convey that he's been working on them off and on for the last few days while he was searching for things with which to wrap gifts. And then he worked on them in between lines of knitting, to keep everything from getting too mundane.

But he was trying to keep to himself the whole time, so of course Tony didn't notice. He was going to hang them up around the house, and he might still, later, when they go home.

Instead, he takes off an ornament that he made for the tree by layering a thin circle of cellophane and then stacking cut-out shapes on top from some old silver wrapping paper scraps. He thinks Tony should recognize the grooves and dips the wrapping paper makes, since it's an arc reactor.