Two months ago I was contacted by the Guideline.com team about customizing the Melaka theme for their company blog. They already purchased the theme and wanted to customize it based on their new design. The new design takes advantage of most of the elements in Melaka. It comes with nice additions like the drop-down menu and the top part of the topics in different colors.
The design was made by InVision and I was happy I helped them implementing it to Ghost.
If you are looking for Ghost theme customization and have a custom design you want to implement, feel free to contact me with more details about your project.