Using "nice":
* Nifty and funny
* Nice and nutty
* Nifty and naughtily funny
Using "funny":
* Funny and fantastic
* Funny and fabulous
* Funny and fantastically friendly
You can also use alliteration with other words related to "nice" and "funny," such as:
* Charming and comical
* Delightful and droll
* Pleasant and playful
Ultimately, the best alliteration for you depends on the context and the desired effect.