I've created different products over the years, from digital tools to reflective tweedbuttons (handmade/real stuff :) And this has bin put in different shops that fits the project.
Over at Society6 I publish work for print. You can find posters, cups, t-shirts and much more printed on demand. Nothing is created before you buy it, and it's a good thing. more cool things in the world, but no storage stacking up on stuff.
PolarWhite stationery is a MockUp collection for Photoshop CS6 and up.
I needed a presentation tool for my designs, and created a versatile mockup package that are useful for most design projects.
Sampled Light is a HDRi sky sequence loop (!) ready to use. This will give you a unique way of presenting your 3D renders.
You can buy it at Creative Marked.