What do you do with unused designs?

Hello everyone!
What do you do once a superbly sensible design goes unused as, not because of your fault, the client loses interest within the project?

Mousse said:

Keep a copy in storage somewhere. It might be useful in the future, you never know.

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designs216 said:

Exactly right. That's billable work that may be billed again for zero effort.

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Hello Mousse & Designs216, I also use those designs in my portfolio or keep it as inspiration for the next job.