The next cardboard accessories Labo from Nintendo for Switch are very fun. But if you can not wait a few weeks to make your own great switching devices, or legitimately recognize that Lego is a superior construction material to corrugated paper, you can start your DIY projects a little earlier with Lego Switch accessories (through Motherboard).
The Lego Switch accessories come from YouTube vmln8r, which took an accessory rail Switch printed in 3D (such as how the Joy-Con controllers are connected) and modified it so that it could place Lego Technic parts in its place. From there, the sky is the limit: vmln8r used Lego pieces to build a functional support for the Switch (instead of a terrible Nintendo), a grip control, a steering wheel mount controller and more.
Interested amateurs who want to build their own business can start with the basic 3D printed rail here, but they will need to modify the things further to add the Technic compatible mounts, which regrettably does not include vmln8r instructions. Assuming you already have access to a 3D printer, printing the Lego compatible grips should be much more economical (think $ 15 to $ 20) than a $ 69.99 Nintendo carton kit. Who needs Labo?