schnullelieber: yes, I've done some snowshoeing around Morzine. Some of my snowshoe guide training/exams took place in that area in fact!
There is some waymarked stuff near the resorts, but I'd really recommend getting a map and a guide book and going slightly further afield. It's a great area for snowshoeing (makes sense seeing as it's a bit flat for skiing/snowboarding ).
The area from Le Sincerneret over to Chapelle de Jacquicourt (just outside Les Gets) is really beautiful. There are also quite a few "snowshoe summits" that are do-able too. I'd have to look at a map to make more specific suggestions. There are some good snowshoe guidebooks to the area (in French):
Gareth Jefferies (endlessride on here!) and Caroline Hale are both British snowshoe guides working in the area. They're both pretty helpful and would probably give you a few suggestions.