Some modifications are useful; they improve performance, improve reliability, improve appearance, improve comfort, improve usability, etc. Some modifications are just silly; which type is this?

I would guess this falls under the heading of 'aesthetic', done for the pleasure of the owner.

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1985 300D-189k The 'UD', Ivory and Pinkamino
1979 300D-211k Dark Gray, Parchment
A 1980 Harley-~166k and
A 1994 Ford diesel pickup-349k and
A 1990 gasser Volvo wagon-145k

depends on who you ask. How would this be any different than one made to "improve aesthetics"?

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth