Color EVA foam sheets for craft are a great medium for quilling projects too!
They are easy to cut and paste as compared to cardboard.
The quilling coils stick easily on them as well.
They are also thicker and more long lasting than paper.
They form an excellent base for quilling cards and quilling photo frames. Or you can cut them into decorative patterns and stick them on top of other mediums too. Their soft texture and bright colours make them really attractive for craft projects for kids as well!