Everybody gets bored. I believe Mark Rippetoe referred to this as "Bodybuilder ADD" the desire to constantly change stuff. Anyway, to take a page from WSBB, it seems reasonable to me to have some portion of your workout that is very stable (For instance, every monday is a squat day... whatever your preferred programming, every monday you squat. Then you have a planned support exercise for the month. We will say that it is good mornings. Then you have a third leg exercise that you can feel free to change up week to week. Something that targets a weak spot or has some general carry over to leg/hip/lower back strength. Maybe calves one week, pull throughs, etc. That way you have something very stable that you can always reference back to as your "proof" that you are getting stronger (squat). You have something that you stick with long enough to get some pretty specific advancement in (Good mornings for the month), and then you have a slot open so that you can get your artistic or impulsive side out

Keep in mind this isn't really "programming" so much as just a philosophy to keep things fresh and interesting. If you are bored or wishing you could do something else then you won't be fully into the work you are doing. If you change everything you do on a whim you really stand a poor chance of making any real progress.