I didn't hae a very wide selection of flowers, so I just used what I had--some hydrangeas and a flower I found on the sidewalk.  I also used hydrangea leaves to add some green ink.  The hydrangea didn't take the ink very well, so I have a lot of small flecks on my paper.  I tried using gelly roll metallic gel pens, but they wouldn't dry, so I used colored Sharpies to add some more dimension.