Quote sizes — Depending on the length, Mac Envy will style your quote font size in relation to how long the quote is. Short, medium and long quote lengths all have examples on this demo site.
Wide-ish layout — Photo and video captions are floated alongside the content instead of after it. This is because the layout is wider overall than normal tumblelogs. However, it’s not quite as wide as Polar Bear or cameron.io. It’s about 100 pixels smaller, so photos and videos are all 400 pixels (or thinner).