In terms of like writing code, none of my layouts have been difficult.... Some are more time consuming than others, things that require writing more code take more time + sometimes it takes me a while to settle on a design. The most difficult codes I wrote were years ago when TH still had it's legacy layout cuz that layout was a mess and difficult to work with, but it's also long gone.

The "Tug" bundle took me a particularly long time to make because I kept changing my mind on it's design, so I kept having to recode parts of it.

"Topsy" bundle also has a lot of time put into it, mainly because it comes with so much HTML and I wrote in more customization options for it.

The "Extensive" HTML that comes with Frayed was probably my least favorite thing to make; it's not difficult but I don't enjoy coding all those tabbed boxes, it's very repetitive and it's easy to loose my place as I'm writing it. I made that HTML purely because it's a remake of an older layout that I know a lot of people like that design. And people do buy it, so I can't complain, I was fairly compensated for making it! But still was my least fav to make LOL