Most of the games you've been playing get you to think fast, have fun, and keep busy. Now, add in some serious imagination and creativity. You can name a new kind of ice cream, and talk about what's in it and why those things would taste good together. Make up a slogan — even a way to advertise, or get people interested in your creation.
Or, you can create a whole new country — maybe a utopia. Would you have a new language, or use a combination of languages that already exist? If you created a country, where would it be? Would you want to be the ruler?
The best thing about these games is that you can play out loud, and talk about them with people in the car. Or you can just think about them if you are on a plane, or train, or everybody's sleeping.