Why can't new things have the same charm as objects touched by time and history?
If it isn't old and rustic, we can at least make it look that way, right?
Let's take rust. There are many tutorials out there for creating faux rust. Some suggest combining about 3 colours of paint using sponges, there are also (toxic) metallic paints and rust activators.
If you're like me, you prefer one-step non-toxic DIY.
FOR EASY DIY RUST:
Scrape some rust off old objects and collect it in a jar for when you need instant rust, then simply apply it with craft glue. (PS: If you're going to do this, please wear a mask to avoid inhaling fine corrosive elements).