Before thinking to the look, you should seriously considere adding tunning options :
- slot control
- better credits / ranking in upload queue
That is those think that make P2P functionning.
And not looking for new theme, that wil take something like 1Mo more in the binary, and that will serve anything. most the time aMule is minimized and run in background, so where is the need to have a good looking?
that is my opinion, restricted to my mind. Up to you to take your decision, and make look n feel evolution to have more people using aMule.
To my mind, it is not necessary to change anything int he look. Because people looking for aMule, are much interessed by its multi-plateform features (not restricted to the only ZINDOZ, like other ed2k clients)