Use a custom model, here is an example of different lengths
http://nutcracker123.com/nutcracker/images/custom_icicle_model.png
meteros, even text will work with this.
if you will have 20 icicles (varying length), with the longest being 10 nodes.
then build a grid for custom model by
model width? 20
model height? 10
start in upper left corner and number the nodes, consecutive