I have a great pamphlet with Pi Phi cross stitch designs that you could borrow--I may have a needlepoint crest one around here somewhere. My cross stitch designs also include carnations.
I don't know how well this works, but have you tried an online program that allows you to use images from your computer? I found this: http://www.myphotostitch.com/ but I haven't tried it myself. Maybe upload a JPG of the crest you want??