Ok, so this one requires a bit more effort. By that, I mean, it requires an iron.
That used to be a deterrent because I didn't want to ruin my iron. But I got myself a mini-sized one recently. I had searched for a craft iron, but traveling irons seemed to be what Amazon felt I needed. Who am I to argue.
So if you got yourself an iron that you don't mind possibly getting gunky, this technique is super fun.