I'm new to the forum. I want to make my sons cake topper and I'm thinking of doing the Mickey head with rice crispie so it won't be so heavy. Any input would be much appreciated.

If you're just looking for the hat and ears. Krazy Kool cakes has an excellent tutorial on youtube.

Here is a tutorial I found on Pinterest.....it does not use rice crispy treats but may be a good visual aide as you go through the process of creating the topper....

http://www.marialunarillos.com/blog/2014/05/como-modelar-a-mickey-mouse-paso-a-paso-con-fondant-y-pasta-de-goma.html