I learned this technique of crafting paper roses back at school for math class. It is very easy. All you need is one or two sheets of what ever color you want your rose.
Step 1: Folding
You will want to fold your piece of paper in half and then in half once again.
Step 2: Strips
Open it up and cut along the fold so you end up with four strips.
Step 3: End to End
Now tape the pieces end to end to form one long strip
Step 4: Lets Roll
Start on the corner and start rolling to for the stem keep rolling until you have the desired length. Fold the piece of paper over to make a point and slowly turn wrapping around the center. you will continue to wrap and fold until the rose is complete just add a little tape to keep it in place and unraveling.
Step 5: Spray Paint
I love to spray paint my finished roses or I will do it before i roll it up. Be creative have a rose with polka dots or something make it your own. Have fun.