Here are 4 notebooks from the SegaShop online.
They all have coated black metal spiral binding & hard card covers. The first is patterend with items from the Sonic 1 special stage. The second has the detailed 'gold' (its a yellowish) running Sonic (modern) with Japanese text. The third is the line work "Emerald Club" art & the last is a Green Hill 16 bit scene with simple Sonic / wing ring art in the 'sky' area.
Each notebook is a nice idea. The complex line arts are a good application for something you're close to/can see the detail each day. The GHZ is a little boring, & the special stage qualifies for 'subtle Sonic'. The problem is that each ordinary notebook is 16 dollars. At that rate, no one would want to take them to school where they could get damaged in a backpack. These are all 2018 / Summer/Fall items.