This is extremely easy and cheap. I´ve seen these types of organizers for 150 pesos (13 dollars) In my case, this was completely free since I used scraps and foam sheets that I had lying around. If you want it to be larger, just add more foam.
by Easy Paper Origami
by Guidecentral English
by marghebeadbybead
by CbyS Paracord and More
by Uppunuti Home
by Simple Easy Art
by Craftz Talent