It would be nice to see them change up the base relics if they are adding them into undisputed. Even something simple as numbering the hits & having them be only multi-colour swatches so everyone isn't pulling the same black swatch Seth Rollins or green swatch Cena. And to add onto the previous list of ideas:
Dean Ambrose Jacket
AJ Styles Gloves
Brock Lesnar Gloves
Bray Wyatt Hat
Kane Mask
Lana Dress
R-Truth Bandana
Roman Reigns Vest
Could also do a Ladder Match set with pieces from ladders used at TLC, MITB etc...

Throw in some cool odds & ends relics with an updated signers list to mix things up a bit & keep it fresh......we can hope right? :)