Group Sites or Social Network Sites. There are usually dedicated sites for different groups depending on what they are doing. Social Networks are much broader, but groups within them like scrapmoms, scrapsisters, and so many more usually share their ideas and projects. It is up to you whether you will join any group if you want to get more details and interact with the people within the group, but you will get templates in there.
What is the initial process and how do you get your hands on WordPress in order to create your own website templates? You will need to go to WordPress.org and download a version in the language of your choice. You then extract the zip folder into the root of your site, and you will see tons of files pop up. Don't worry about opening those or going into them as what you need to work with will be significantly small. Then go to yoursite.com/wp_admin/ and you will go through the simple installation process which is basically just WordPress hooking itself up to a database which it creates in your server in order to work. That's all there is then you can start rolling.