How to Make a Foolproof Flowery Wallpaper Pattern - Screencast
"Pattern possibilities in Illustrator are endless and knowing them back-to-front can only be a good thing. The key lies in perfect tessellation and while there are several ways of achieving this, it needn't be more complicated than the following steps describe" - Ian Yates
Let me know any feedback you have in the comments. I plan to do more of these screencasts on a regular basis, so any advice you all have would be helpful.