I think they're great visually but less practical. A text and icon combo (if you want to use icons not just text) would be ideal. Icons don't tell where you're going and it's something thats a bit of a personal menu diskike of mine. I want to look at the menu and understand it in a few seconds to go to the pages that are of interest to me. It's more of an issue with touch screens, but still bothering when you have to hover with your mouse to see the url to get an idea.
That said, I think icon menus can work well for specific uses, especially when you know where you are and what to expect (like a game, subcategories, gallery or writing/book mechanics) but for a general website menu I find it to be too tedious to navigate unless the graphics are super straight forward, feature easy to understand and common topics and the topics differ enough from each other to not get confused or mixed up.
For example your last graphic is I assume an open book, meaning the guest book in the menu. To me, it looked like a shield at first, and without context, I couldn't make out most of the icons that well. The text menu on the other hand is easy and fast to digest.
Ofc at the end of the day it's your website, do whatever you enjoy! Just my two cents