Based on the excellent suggestion by digdug, this community is to share style sheets/.css templates you can use for posts. If you're a .css expert, we'd welcome some experienced experts to become moderators.
Please do not redefine standard html tags in your templates (e.g., don't do this: blockquote { font-size:30px; }), as it can cause problems with comments that use those tags. Always create your own classes - e.g.:
<style>.my-blockquote { font-size:30px; }</style>
<div class="my-blockquote">my very large blockquote</div>