This is not so much as a pattern as a recipe: by following the instructions below and tweaking them to you own likes, you will be able to produce a variety of flowers with just these instructions.

Although there is no particular yarn listed, wool tends to work nicely. Something with a lot of drape like bamboo won’t work so well to hold the shape of the flower.

Really, as long as you use an appropriate size pair of needles to yarn, you can use any size. An easy way of making different sizes of flowers is to change to a thicker yarn with bigger needles, and of course vice versa for a smaller one.