I love to make these super simple ribbon wreaths. This year I made one for Halloween.
You just need a foam wreath form, several spools of ribbon, and small straight pins.
You cut the ribbons into small 3-4 inch long strips. Then take a ribbon, make a loop, insert a pin where they overlap, and insert it all into the foam wreath. There are lots of tutorials online about this if you need a more pictorial walk-through.