You could use picture clips/garland (see the pun there 
) Here are a couple examples but there are many configurations from lighted clips to collages, etc.
https://www.amazon.com/Love-KANKEI-Picture-Photo-Frame-Decor/dp/B01M3P1CXR/ref=sr_1_8
https://www.amazon.com/Picture-Hanging-Display-Decoration-LEJHOME/dp/B07LDQ59JR/ref=sr_1_19_sspa