Last blog post, I've told you about great learning resources with playgrounds. Searching github, you can have several example already available. I suggest you to build your own. Your playground will be your toolbox. Get inspired, create you own code snippets and ... share it!
I started Swift with the Swift guided tour. I was impressed you could read and try code snippet at the same time with Xcode. Excellent idea! Googling around, I bumped into this nice project swift-playground-builder which takes markdown document and generate a playground. How does it do it? simple Playground is a folder with xml files... But it looks like magic, you can create your doc à la "guided tour".