...out of fondant?
I have a ruffle cutter, is this as simple as flattening out the ruffles and then attaching to the cake? Ruffles made out of 50/50 gumpaste and fondant?
These are NOT made with a circle (Garrett) ruffle cutter.
These ruffles are straight strips of paste with the edges slightly softened with a ball tool. You can make them any length that is easy to handle, the longer the faster they are to stick on.
Do I dry them a little bit before I put them on?
You don't dry straight strips at all because they will crack.
You have to put them on as soon as they have been rolled and edged.