Like as another token purchase for killing Snarby, JK, Twins, and vana.
examples:
Snarby= a rug made from his fur
JK= his crown as a trophy statue
Twins= matched pair of interactive statues - Effrul
Vana= maybe like a throne or his scepter
feel free to add to this in the comments i think it'd be fun to read them
The Twins could easily translate into a matched pair of interactive statues, i.e. they could go through the transforming stages the boss does when activated. I love the Snarby fur rug idea, but I think any or all of the bosses would make for excellent decorative statues or busts.