How convenient! You can make such a self-made cardboard canvas in exactly the size you want :)
Links:
Self-made Cardboard Canvas (how to make a cardboard canvas)
via: how to make a cardboard canvas by Alma Stoller
…compilation of tutorials
How convenient! You can make such a self-made cardboard canvas in exactly the size you want :)
Links:
Self-made Cardboard Canvas (how to make a cardboard canvas)
via: how to make a cardboard canvas by Alma Stoller