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Hostinger - 15 Free Ghost Themes (Article)

Make A Website Hub - Best Themes for Ghost Platform - Free and Premium 2019 (Article)

Webdesigner Depot - 10 Free Kick-Ass Ghost Themes (Article)

Colorlib - 28 Best Free Ghost Themes With Simplicity In Mind 2019 (Article)

Wow Themes - 10+ Ghost Blogging Themes (Article)

Design Shack - 30 Beautifully Designed Ghost Themes (Article)

ThemeFunace - 50+ Best Ghost Themes for Simple Clean Blogs 2017 (Article)

Vanila Blog - 10 Free Ghost Themes (Article)

Codester - Top 20 Ghost Themes 2019 (Article)

WinningWP - 35+ Superb Free and Premium Ghost Themes for 2015 (Article)

SpeckyBoy - The 15 Best Free Minimal Ghost Themes (Article)

WebDesignDev - 20 Free Ghost Themes with Minimalist Designs (Article)

85ideas.com - 10+ Best Ghost Themes (Article)

EGrappler - 25 Free Themes for Ghost Blogging Platform (Article)

CodeCondo - 12 Free Minimal Ghost Themes (Article)

HaeckDesign - Top Free Ghost Themes & Ghost Skeletons | Freebies (Article)

DesignHooks - 50+ Free Ghost Themes 2019 (Article)

GTheme - Popular & Best Selling Premium Ghost Themes | Ghost Themes and Apps Marketplace (Dead Link?)

Theme development

Ghost themes are written with a templating language called handlebars, which has a set of dynamic helpers to insert your data into template files. For example: {{author.name}} outputs the name of the current author.

Ghost has full and extensive theme documentation which outlines every template file, context and helper that you can use. You can also get started with the useful starter theme, which includes the most common foundations and components required to build your own theme.

If you want to chat with other people making Ghost themes to get any advice or help, there's also a themes section on the public Ghost forum.

And some websites about building themes:

How to make a Ghost theme

Webflow to Ghost | Build Ghost Themes totally in Webflow

Dana Hooshmand | Build Anything

Grant Winney | 5 Quick Hacks for your Ghost Theme

How to Create Ghost Themes: Introduction - YouTube

Some of my personal faves on ThemeForest:

https://themeforest.net/user/pxthemes/portfolio

https://themeforest.net/item/floro-responsive-gridalicious-css3-ghost-theme/7127851

https://themeforest.net/item/nuevo-a-timeline-for-ghost/6888181

https://themeforest.net/item/phantom-responsive-parallax-theme-for-ghost/6836135

https://themeforest.net/item/quill-minimal-blog-and-magazine-ghost-theme/19623926

https://creativemarket.com/pixelandkraft/203888-Archster-uniquely-powerful-layout

https://themeforest.net/item/athena-modern-ghost-theme-with-masonry-layout/22751436

https://themeforest.net/item/valkyrie-a-highly-visual-ghost-blog/22576630

https://themeforest.net/item/whie-minimal-ghost-theme/22547593

https://themeforest.net/item/breek-a-masonry-theme-for-ghost/13112831