I just did a cake like you described yesterday. Here it is... http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=708203
I bought my wires (26 gauge, 18 in, white) at Walmart. They worked perfectly for the size fondant stars I made which were about an inch in size. I cut the wires in half first. I then rolled out the fondant and cut the stars out. I immediately and carefully stuck a wire into the star until it was about 3/4 through the center. If the star bulged a little I rolled lightly back over with the fondant roller. I layed them flat to dry. I didn't have any issues with them falling off of the wire. I had planned on dipping the tips of the wires into piping gel and then reinserting if they did. I took a clean straw and pushed it down into the cake where I wanted it. I then used that straw to measure and cut the straw I would be using for the cake. I took the wired stars and stuck them in the straw one at a time arranging them the way I liked. I stuck as many as I could until it was too tight for more. Then you just stick the straw into the cake.
Floral wire is used. You can get these in craft stores and they come in different gauges. The smaller the number, the thicker the wire.
I have different gauges on hand and play with them to see which size holds the pieces better.
Use plastic coffee stirrers or straws inserted to the cake to hold the wires.
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