A Smarthome Gingerbread House. Complete with motion detector, rotating tree, economically friendly lights and just slightly of key and annoying jingle bells.
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Gingerbread house ( Receipt: https://sallysbakingaddiction.com/gingerbread-house/ For the architectural stuff just wing it, hope for the best and plan on using a bunch of industrial glue. )
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Arduino UNO
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Piezo Buzzer
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Digital RGB LED Strip
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PIR Sensor
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Servomotor
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Wires
Wire up everything as shown and upload the code. Merry X-Mas.