In reply to Darron:
The logical way to do Easy Rider is to do one of the Holiday on Ice branches first as descending the GR path takes you very close to the start of Easy Rider. When I was there 3 weeks ago there was a traverse path linking the start of Easy Rider to the GR path. Otherwise, you're right, the base of Easy Rider is higher and it's a bit of a flog up the GR path to get to it. Don't be taken in by the 15m approach time to Easy Rider as given in the guide. It takes quite a bit longer. Descent from Easy Rider is by 2 abseils, one from a tree at the top and one from the bolt belay at the bottom of P2.
If I was climbing with a complete beginner, I'd do Holiday on Ice LH branch first. The RH branch is a bit steeper this year and this could be done on another day as they basically only share one real pitch at the start, which is short, steep (for a novice) but usually well stepped. If reassurance is needed, it's possible to belay right above the steep bit, either on a bolt on the right or on a tree on the left. Easy Rider, though shorter and slightly easier, may well be a more intimidating experience as a first route for a beginner.
Formes du Chaos is a much longer and more serious route, as indicated by the grade. As with all ice routes, it's difficulty does vary from year to year and it was much easier the second time I did it. There was a sustained 90 degree brittle ice pitch on it the first time - much closer to WI5 than WI4. Personally, I wouldn't go near it with a complete novice, but you are the best judge of that. Perhaps it'd be something to aspire to towards the end of your trip if things have gone well. An easy 5+ min walk from the car park will take you to the base of the route and from there you can see the meat of the route. As I've said, best to judge for yourself.
Current conditions & photos here:
http://www.ice-fall.com/ri/Conditions/de/glace/307.aspx
Dave