Automate window blinds
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If you know the weight of the curtains and the diameter of the roller then you can calculate the torque required by the motor.
Then you need to look at what power supply you have and the type of control you require i.e. do you want to have a switch with limit switches so that you can press the button to raise or lower but if the blind hits the limit then it will automatically stop in which case you will have 4 inputs. Alternatively, you may just want a switch to go up and one to go down so with a dc motor you could just wire it to switch polarity and not bother with the limits.
Personally I'd include the limits as this is less likely that it will damage anything.