Freebbble!

Actual license is free for both personal and commercial projects, with attribution back to MediaLoot. No Creative Commons license mentioned, though.

(Free) Coffee@2x iPhone Controllers is a free UI Kit design resource made by Dribbble user Sebastiano Guerriero. As far as I can tell, its license is Unknown.

Helpful hint: Dribbble users are nice. If the license is unknown, it is usually because they forgot to mention it explicitly; not because they were being stingy. Ask nicely and they will probably allow you to use it.