This is my second time trying a french manicure, so it is not very good, but I suppose it takes some training.
I've tried to do a normal french mancure, and then added some green glitter. And a Butterfly stamp on the thumb. Green, of course! (still working on how to get these stamps sentered ;-) )
I found this video on how to do a french manicure very helpfull :-)
Oh, and here is a French video from Mayparis! I would love to try the first technique next time I do a french :-)