pens with different weights sounds like a nice art installation

colored edges notebooks is probably a product I'd buy

bookmark with variable transparency looks like a cool thing you buy/gift that's eventually realized to be totally impractical (but it was probably worth it for a bit)

and origami packing looks cool, but not something anyone would even think of using outside Japan/east Asia because it's a culture thing

the rest I don't understand and don't like (also... last one is simply a pen with no gimmick at all? eh?)

the last one is a pen with a square prejected LED light, or something.