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Out-of-Shield Options
The first thing you should know about the ICs' shield:
There's a 6 frame delay in their shield. This means that when you shield, Nana won't shield at exactly the same time, and she won't attack out of her shield at the same time you do. This is very troublesome for some matchups, so look out for it.
Squall Hammer Out of Shield
If you're going to try to pull this off, wait until the ICs are synched back after shielding. If not, you're gonna do a lame desynched Squall Hammer.
Neutral Air Out of Shield
Not a very spectacular option, but it's an option nonetheless. When your shield is attacked, do a rising N-Air to get them away from you.
Unfortunately the Ice Climbers don't have many out of shield options. Most of their defensive play is revolved around punishing mistakes. Having a lot of slide when attacked and a 6 frame difference doesn't help at all.