The key(s) to get back to the "While Playing Screen" (WPS) depends on what screen you're on!
From the Main Menu it's just the HOME key.
From the Files Tree it's HOME+SELECT which is not very "one hand friendly" and, even with two hands, you have to be damn quick with the SELECT key because holding down the HOME key on its own for more than very short period takes you to the Quickscreen menu.
From most of the other screens, I don't think there's currently any defined way to get directly back to the WPS.
I've modified the key hierarchy to get around this and a couple of other issues I personally didn't like (e.g. accessing the Pitch Change screen by holding down the PLAY key), but I must admit I think the Clip could use a little bit of a rethink of it's standard keymap.
I can't help with the washed out album covers - it's not something I pay much attention to (the clip is usually in my pocket anyway.) Maybe it's a theme issue, in which case, selecting a different theme might help?
Eddie