I used a panel piece for the center that is how I start all my quick quilts

and add stripes any width you like and the length of the material
center top batting backing sew around all sides (I like to use spray basting so I don't have to pin it and also I sew vertical lines before I sew all around so I can keep the material nice and neat) you can do any way you like
then I cut stripes (it is based on the design in the material as to the width I cut it) right sides together on both top and bottom then I put the batting on to of the top pin (I use the center and place the next row top RS together with batting on it then backing center with the next row back right sides together and pin) it all together and sew trim batting from the seem and fold over press and sew your vertical lines again you quilt as you go
You can embroider they rows if you like or just use material
go around as man times as you like
you make to the size you want