The rolled flowers are easy to make and require little effort. When making them out of paper, you do need to have a glue gun or glue dots available to hold the centers in place but otherwise they are simple rolled spiral cut circles. For a great tutorial, check out Joanne B at Splitcoast Stamping/.
The "crumpled" flower are even easier.
You will make 4 petals like this for each flower. Stack them and push a scrap-booking brad through all layers and secure. You now have a flat 4-layer flower. Starting with the top layer, crumple it around the brad, then do the same to the 2nd, 3rd and 4th layers around all of the layers before it. Simply loosen the crumpled petals from around the brad and Voila! a flower. Attach it to your wreath with hot glue.
Using pages from children's books, really adds color and texture. Any paper will work - explore your collection. Go on and do it.