I've given directions for making the flowers and for making the vase. You don't have to do them both... You can make some flowers and put them in a store bought vase or you can make the vase and put in some silk flowers.
There are 4 different types of flowers you can make.
Directions for making the vase:
Decorate the jar with paint or markers. You can paint the
whole jar another color or leave it white and add some design with a
color that matches your flowers. If you are really
artistic/ambitious you may want to paint a maple leaf on your vase (or a few of them...)!
cut a square of tissue paper (white or yellow) about 2" by
2"
scrunch the cotton filled tissue paper around the end of the straw and wrap a piece of scotch tape around it
Put 4 or 5 petals around the cotton filled tissue paper. Tape
them on.
Continue adding rows of petals until you have a nice full
flower. You'll need at least 4 rows of them.I've included a picture of ONE of the flowers made with each template so you get a feel for how they look. Each flower has 20 to 30 petals in it. These templates aren't printable... just use the images as a guide when cutting out your petals.

heart shaped petal template
(I think it looks like a rose or peony flower -- this is my favorite)


large pointed petal template
(I think this one looks like a water lily)


small pointed petal template
(this has twice the petals of the others... 40 to 60 petals in a flower)


tri-petal template
