Hi! 

I need to make this cactus cake (Pinterest is ruining my life!!!)

https://www.pinterest.com/pin/308355905707975439/

any tips? I was thinking the brown bottom cake and the green part rice Krispy. What kind of structure do I need? 

Thanks 

Cool cake! Yes, that's how I would do it...I think you just need to use dowels/ lollipop sticks to attach the RKT pieces to the main one. Just make sure that you stick the lollipop stick in (in both pieces) or use a dowel to create the space,  before you let the RKT harden and cover with fondant. It will be hard to stick it in once it's completely hardened.  Does that make sense?

If you've done a lot with RKT you will know this already...