I am doing a Tinkerbell Woodlands cake for my daughters 15th birthday party this weekend. Two tiers with Tink sitting on a "tree stump" cake on top. My daughter wants some whimsical looking mushrooms on the cake, and I have never done any mushrooms other than meringue. She wants white bases with red tops w/ white dots. Any suggestions on shaping the tops? Domed, Oblong? I have no idea on this one. The cake she saw them on is at ...
http://images.google.com/imgres?imgurl=http://bp2.blogger.com/_Dikd55CA9W4/R4VY__M8RPI/AAAAAAAAAxE/rESEvzkSsr4/s400/tinkerbell.jpg&imgrefurl=http://cakesbyanitha.blogspot.com/2008/01/tinkerbell-fairytale-cake.html&h=314&w=400&sz=36&hl=en&start=111&tbnid=XozEn39ArMpImM:&tbnh=97&tbnw=124&prev=/images%3Fq%3Dtinkerbell%2Bcake%26start%3D100%26gbv%3D2%26ndsp%3D20%26hl%3Den%26sa%3DN

Will these be self-supporting or do I need to run a skewer or something thru them? They look top-heavy to me.

i roll a ball and then roll that into a cone shape, you can tweak it to get a more whimsical shape. then shape your stem and stick em on. you can put a small piece of spaghetti if you want some insurance, which doesnt hurt!
for the spots just roll differnt sized balls and flatten them and attach with glue.
let them dry really well, at least a couple of days if possible. HTH

Here is a pic of some fondant toadstools,
http://www.monzis.com/carvedcakes_by_robin.htm
HTH's