The A6 Muji Dot Grid notebook is my go-to. Like all Muji products, it's unbranded and has all the attention to details you require. It's tape and thread bound, with a soft cream and a faint dot grid that helps your work stay tidy but won't cramp your style.
It's silly, I know, to actually buy these faked out boxes posing as books. I like that it makes my space look more like a somewhere I want to think and work on ideas, rather than an Office Max catalog. I use the big book to as a monitor stand and a place to store completed sketchbooks and the mid-size book as my toolbox. Plus they're $5 or something at Ross. Find a container that you want to see on your desk every day!
If you are in or have friends in Japan, hunt down the Nanuk sketchbooks. The page is a soft cream color, with thread binding and absolutely no branding or logos anywhere. Unlike most sketchbooks (even those from Muji) these are nice and tall which is ideal for note taking and designing for web and mobile apps.
I love the hexagonal anything from Muji. The grip has a soft touch and the shape means it never rolls off the table. These pens come in all colors, and the full set includes its own carrying case. I stick to the black 3mm pen for my daily ball-point writing.
The ruler I have and love is 12-inches, clear with a metal edge. The metal edge is key for cutting paper and tracing lines (it also keeps ink off your paper). This one is a close comparison but has 90s style Marker-Felt font and dark lines. It's clear, has a metal edge and is on Amazon Prime. It's not sexy but it gets the job done.
People love pointing on our screens and gifting us their fingerprints. In addition to a screen protector, I keep one of these handy, especially for keeping mobile devices smudge-free. Almost any microfiber cloth will do.