I wouldn't want to morph insects of any kind, too easy to smush, and too many insecticides in every household.
A spider, maybe, but same principle, too many anti-arachnid sprays.
Although morphing into a trantula and scaring the **** out of some chick would be priceless.
I'd never want to morph any type of fish, unless it was higher/est on the food chain. Nor if it is considered "pretty" and someone would be tempted to collect and display me.