[postimage id="3723" thumb="900"]How do I do the blue part of this icing? Any ideas would be great :-)

It looks to me like b'cream from the big grass tip.  Can't remember the # but the small one is # 233.  You probably need the big one. or cut/roll individual pieces of fondant.  

I'm with @kakeladi ‍, that just looks like piped icing. I'd just use a large round tip, though, but I guess it depends on how big the cakes are. That's a lot of icing...

Thank you-yes heaps of icing! I'm making for a cake smash so most of it won't be eaten anyway!