I love plants in my house. Books and plants, those are key ingredients for me to make my house warm and cozy. I did not have a lot of plants when I was younger, but in the past years somehow I began to put more plants in my house. And they thrive!
A few weeks ago I bought a few new plants, since plants do not have eternal life and despite my good care some die. My mum and I had a great morning in the gardencentre, picking out new plants and giving them a good place when we were back in my house.
As you can see, I do not have huge windowsills, but I do have a lot of bookshelves. No reason why you cannot put plants on those as well!