Here are the four nodes I made:

(I realized that the paper one for the battery was wrong, so I changed it later), and here are the 4 connectors:

I mostly focused on creating connectors that would be easy to clip on and take off because I usually have a really hard time doing that without damaging the circuit or accidentally unplugging a wire.

I also wanted to make connectors that would damage the materials the least. For instance, the bobby pin/and paper clip would be perfect to easily slide on and off of materials that can get wrinkly very quickly. The pin and safety pin would be great for pinning fabrics.