Most of the time I stay with the cover given (if any*), but if it offends me enough I'll change it. Or sometimes I'll update so a series retains a consistent set (not something I was able to do with my paper books.)
* Not so much now perhaps, but for a long time a lot of tradpub ebooks came without a cover (just the standard plain-paper thing), and I'd normally add a proper cover on those.
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