I don't think you can, the skin was designed at a specific size and its impossible to alter it (based on my past experiences with foobar). You can try to download a smaller skin to your liking.
Here is mine:
I was wondering if its possible to sync a song/movie into my ipod and then removing it from my computer; it is possible to keep the song/movie on my ipod on my next syncing? Because all these movies are taking up my computer memory!!! BLASPHEMY