My favorite pin cushions to use are bigger ones-so the pins don't poke out the bottom. I fill mine with crushed walnut shells. I have lots of pin cushions in various shapes and sizes. Dress form one, a wool cinnamon roll, chickens, cup & saucer, campers, pumpkin, pear, apple, tomato, stacked squares, a little chair, etc. Also have a round magnetic one.
If you want to make one, perhaps check out Pinterest, and also google pin cushions. Lots of cute patterns out there. Maybe make a dress form one? A funky chicken? Amy Bradley has one called "Ms. Pinny Cush". Heather Bailey has a great elephant, and a turtle too.
If you do make one, would like to see a picture if possible.