I love to showcase our travel photos in this way. Every place has had its heyday, or has echoes of a certain time. Using retro and vintage imagery allows us to set the scene, evoke the mood or make a nod to the past. In this case to the Vegas of the rat pack days:
It's as simple as 'drag and drop' with the painted elements and "transfers" that are with most of the packs of digital elements, or you can get as creative as you want with blending and other digital effects.
It can be colorful and fun or traditionally vintage and muted.