Design Works Cross Stitch

How do I convert a picture into a cross stich pattern?
My sister is becoming a cross stitch freak and every little spare time she has you will find it with her tools in a corner somewhere working on cross stitch.
I would like to create a pattern for her birthday, with a design that I made especially for her.
Can anyone suggest what should I do. Maybe there is some online to that converts pictures into patterns….
Pattern maker: http://www.hobbyware.com/pm.htm and PC Stitch: http://www.pcstitch.com both create cross stitch patterns from pictures.
Cross Stitch Kit Kitty Orchid is at www.abullrun.com