I found this cake on here, love the sunflowers on top. can anyone tell me what tips are used to make it and how it's done??

http://cakecentral.com/gallery/1496371/autumn-birthday

It's actually very easy to do: just make a ring of leaves (looks like she used a 352 leaf tip) and small stars in the center (maybe a 14 or 16 star tip.) I did something similar on a 6 inch cake for an older gentleman -- I used a #70 leaf tip and an 18 star tip for the center here: http://cakecentral.com/gallery/320523/you-are-my-sunshine

My only suggestion is before you start that bottom row of petals pipe a ring of icing (any lg round tip such as 10 or 12). Lay that 1st row of petals over it. Then proceed as bobwonderbuns said