They look like buttercream but those can certainly be achieved by using fondant.
Thanks for the fast reply....if using buttercream what size tip do i use. TIA!
i have done similar clouds and i used a tip #12. but i think a #10 might be ok too.
Here's a cake with some clouds similar to those that I did. I used a tip #10, if you want bigger clouds use a bigger tip....you could even do it with just a coupler if you had to.
I just piped a little mound and then drug it towards the center for the bottom part of the cloud, then piped mounds on top of that to give it more of a 3-D look. Just mess around with a round tip, it's really very easy!
Those are just flattened out BC balls. And you can use a coupler without the seam.