I am probably a bit materialistic, and I don't really mind. I like having things, but not just anything. It has to be something that enables me to do something that is enjoyable. I don't buy useless items just because they're expensive.
Some examples, I guess:
Buying a proper camera made me happy, because it enabled me to explore photography as a hobby.
Buying a car will most likely make me happy, because it will let me travel to places that are very cumbersome to get to by using public transportation or a bicycle. Getting to new places will also let me take pictures of more things, which I also enjoy.
Buying a computer made me happy, because it let me do creative things in for example photoshop, and also more easily communicate with friends all over the world.
Buying a TV made me happy, because it let me gather friends and have movie evenings or gaming evenings, which are things I enjoy doing. Buying a new TV 6 years later also made me happy, because it enabled me to view even more details in some of the beautiful scenes in movies and games, and I enjoy that sort of stuff. In addition to that, even though it is bigger, it takes up less space in my apartment. More usable space in my apartment makes me happy as well.
That's just the things though. There are a lot of services that make me happy that also cost money, such as traveling to faraway places and experiencing things that are very unlike what I am used to. I really enjoy travelling, and there are dozens of places I would like to go, but that costs quite a bit to get to.
I don't really care about the money itself though. It just represents resources. Having resources is what makes me happy.