The CSS is an amazing technology, can be used to create amazing sites and experiences at no cost, we love what free resources can do in the hands of good teams of designers and programers, here is a small list of good sites made entirely on CSS and HTML5 with some of the most amazing experiences you can fin there.
The tools like those done by those brick-named companies that create amazing software is not always the best option, sometimes you need to code by hand and learning a few frameworks dont hurt… find some here BTW
Use this as an inspiration to get started with a project, in case your brain needs something to get inspired… and come over, we love desing and we love to reach blogs for you….