Activity for Shannon

Hello! I am more modest, but the dress I fell in love with has a very open keyhole back (pic below). Has anyone closed up a keyhole back? Have any ideas on how to close it up without it ruining or clashing with the dress? Would love to hear your...

I really like these ideas and it seems that DIY is the only way to do them; Online/Etsy is so expensive. I'm not spending over $200 on something to hold cards lol. edited The tree stump is my top choice but it seems hard. I like the moss one because...