After my pen case project, I went on to try weaving a pair of coasters. They have been in frequent use ever since I made them.
My first try is on the left, and the second try is on the right. You can see how I learned how thick to make the weave and how this affects the final pattern.
I struggled to tie the warp ends off properly, but I had a yarn needle to tuck in the ends for each time I switched colors.
I used a ramen box as my loom, with notches every 1/2 inch.
I quickly found that things work better when I cut the cardboard shuttle into a more traditional shape.