Here is a super simple, sturdy, stem-holding vase made out of cardboard!
1.) Cut 4 matching pieces of cardboard for sides and 1 smaller piece for the bottom.
2.) Tape the pieces together to form a vase.
3.) Cover the sides with glue and wrap in strips of paper ribbon (you might have to cut this down into smaller strips) or raffia.
4.) Once the glue is dry, paint over the paper ribbon/raffia with your favorite hue and cover it with spray varnish!
For stability, fill the bottom of your "vase" with sand and remember this one is only for dry arrangements!