I want to pipe a rosette covered cake using white ganache. Can I do it? TYIA

If you whip ganache you can pipe it....White will work if you have used the proper ratios (see Rylan's instructions)
http://www.artandappetite.com/2009/11/ganache-instead-of-buttercream/

Thanks. I watched all 3 videos and have convinced myself to go ahead and try it