I wish there were more epic feats. Here are some ideas:

Name: Epic Armor Skin
Requirements: Character level 20
Description: You gain DR 5/-. If you have have a source of DR other than Epic Armor Skin, this feat increases that DR by 5. If you have multiple sources of DR, then only the highest source amongst them is increased. (This includes blocking DR)

Name: Epic Favored Defense
Requirements: 3 or more Favored Enemy feats.
Description: When you are attacked by any of your favored enemies, you gain 1% dodge and 3 PRR for 6 seconds. This stacks up to 2 + (# of favored enemy feats) times.