So far I've found 4 statuettes and they are so darn useful:
Spider: spying
Frog: Travelling (little guy just moves so fast)
Cat: Rat hunting (soon all of Rivellon will be clear of those nasty things)
Bee: Actually not a bee but beetle, great for pulling guards out of place and ticking off guards. Haven't beat them back to the entrance of Stormfist yet though.
For myself I would say statues are invaluable as they are not only cool but useful for above reasons and so many more. Some monsters will not aggro you in this new form, while some friends may. Though please note that you do not keep you hitpoints or resistances when in your temporary form. And finally don't buy one, you'll find a few sooner or later.
dunyain