Grand Paladin Tyrux
Empress of Light
This is a pretty simple aesthetic suggestion. Once you defeat Skeletron (for the first time in the world) he leaves behind his skull as a decoration, tilted to the side and placed in the center of the dungeon entrance. It would only be able to be destroyed and replaced using the Picksaw. The reason for that is because, as a purely aesthetic feature, when you return to the hardmode dungeon Post-Plantera, the first time you enter the eyes of Skeletron's head faintly glow red.
(Thanks @Awordley for the image!)
Semi-related idea: I, for one (and I doubt I'm alone), don't like brutally murdering my Clothier to rematch Skeletron and grind for his rare drops. With this idea, you'd be able to craft a Cursed Bone at a Demon/Crimson Altar with 30 bones and 1 Necromantic Rune (A new rare drop from all skeleton enemies in the dungeon). Using this item to interact with the skull would summon Skeletron, but only at night.
EDIT: A suggestion by Lecic
When skeletron dies and is converted to gore, his head should be launched in a way that causes it to land at the entrance of the dungeon, at which point it disappears and is replaced with the block.
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