Learn how to Create a Spectacular Grass Text Effect in Photoshop. This is a great tutorial, but it may take some time. The author recommends that you deal with each letter separately, which has its advantages if you would like to alter the letters individually i.e change spacing, move it around etc. However, if you are absolutely fine with the basic font placement, then you can skip the individual treatment, and make the adjustments to the whole word, saving you some time. Below is my result.
Also, I have learned that when the author of a tutorial says that it may take some time to complete, believe them! I did this tutorial a while ago and unfortunately I can’t find the original source. I suspect it was originally on PST (photoshoptalent.com), but the site’s server experienced a hardware failure and everything was erased with no backup. They have started to rebuild with a new site called pxleyes. Anyway, this particular tutorial took hours to complete but it was worth it. It involves taking a normal photo and converting it to an illustration using lots of layers. The pen tool and I became very close that day.