Improving of buttons!
I wanna suggest make animated button. I mean .gif format for its statement (button/hover/clicked). So It will be really amazing when you place mouse there, also add animation, if you just move away coursor.
2nd one - mouse img should be customised (if possible) for making more stylistic for launcher.
3rd one - make sounds (and custom as well) when you clicking on the buttons or another zones. And opportunity for playing sound inside launcher.