The 7x7 frames will fit any regular size minifigs and 9x9 frames are best for figs with crazy outfits like those huge ass coats for some of the One Piece characters. You can also use the 9x9 frames if you wanna expose your characters in even more majestic way.
 
Every frame comes with a stand.
 
Frame I used for taking pictures is 9x9 cm.