Where are the cracks appearing? Between the ceiling and the wall? Or along the walls? If its just minor cracking then maybe disguising them with various painting techniques could help.
You can easily make wallpaper-like patterns with rags or sea-sponges dipped in one or more colors or those multiple rollers where you can have different paint colors rolled on simultaneously.
If the cracks look suspicious, get a building engineer or someone like that out there to make sure there is nothing structurally wrong.
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