I found an online tutorial about making daffodils from fondant icing or gum paste and adapted it to what I had available. You can see the tutorial that inspired me here.
These cakes will be lovely with a cup of tea tomorrow on Easter sunday, but since daffodils are spring flowers these cakes will be great to make any time over the next few weeks. Use a basic cupcake recipe, if you like chocolate add some cocoa powder, and either use some glace icing like I did for speed or spend some time and pipe buttercream icing before placing on your daffodil icing flowers. I have more information on piping with butter icing in this blog post.
Enjoy, these cakes look good but are easy to make so satisfy you and your guests!