It's my first time making BT21 photocard frame stand display, i hope it fits.
You can add thin glass or clear pvc sheets. Or just add sleeves on your photocards, hologram sleeves will look more cute in it ; )
The frame should fit 2 photocards back to back, it's double sided so you can flip it anytime you like.
Add colors to each members, paint the frame any colors you like.
Enjoy : )