Lapis Lazuli. I'm a big fan of rocks and minerals and lapis lazuli is just really cool, and the blocks look nice. It's cool that they're now more useful for more than just decorative purposes with the new enchanting system.
There's definitely more girl skins than guy skins. I'm not sure why, personally I feel like girl skins are harder to make (mostly because of the hair). I think most of my skins are guy skins.
What I think is more annoying is the lack of variety. Most of the popreel skins look the same, just different colours. They don't look bad but it does get boring to see over and over again.