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
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
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.