Spring Start seedlings in an egg shell so cute! Start seedlings in an egg shell and, when ready, plant the entire thing. The egg shells will naturally compost providing valuable nutrients to your plants.
Turn old newspaper into seedling pots. They can be planted directly into the ground as the paper will eventually biodegrade. You can form them by wrapping the paper around a jam jar or similar, or there are 'devices' that can be bought to make the pots.