Adding dust/dirt overlay backgrounds to your project will help give it a vintage/retro look and feel. Here are a few that I'm using in the 3D Text Material tutorial on Simple Video Making's Youtube channel:

Download these dust/dirt overlay backgrounds for free here.
If you want to know how these backgrounds are used in Apple Motion 5, check out this tutorial:

In this video, I'm also using a vintage textured background from pngtree, which can be downloaded for free here as well. Hope you find this helpful! x