I felt the same way with my graveyard bases. For my Nicodem crew I used the large coffin for Mortimer, he has his right leg on the top part so I can show off more of the coffin. For Nicodem, I used the small coffin insert and added a broken section of wrought iron fence behind him.
Also, I blend the insert into the base with a bit of Apoxie Sculpt. Makes it look a little neater.
I do like all of the inserts and plan to use more of them in the future.