Strobist is an amazing website that has taught me so many little tricks using my flash off camera. These images were taken using my home-made grid spot on my flash. It pretty much narrows down the spill of light from your flash. You can read all about it here

You can really see how tight the beam of light is here

I noticed that the light was missing the flower and creating a little spot on the floor so I placed a few petals in that spot and got this

Here's how the front of my flash looked. CLICK HERE to see how to make your own