CUTE IDEAS FOR COMIC?

I am making a comic just for fun at the moment, i want it to be about 2-3 sisters no older then 12, and some adventures throughout the year, like snowmen building in winter and exploring in summer etc, i also want to include things like going to school and meeting friends, i want all/both the sisters to love and be very kind and sweet with eachother, any other ideas guys? this is in manga syle btw :) i am making this comic because i think it would be a great way to practise drawing backgrounds and more complex poses and expressions etc :D