Needle felting is the process of interlocking wool fibres by poking it with a barbed needle. The barbs catch the scales on the fibre and cause them to tangle and bind together.
Try this:
Watch this video on needle Felting for 2D shapes (5 minutes)
I did a similar process as in the video but a piece of red felt was placed underneath and the flower was created on the red felt.
Here are some guidelines to help create your own design.