hmm, well I do use 256 colors, maybe I should reduce the number of colors anyway.. 
IMO anything more than 16 colors on Workbench in AGA is wasteful: wasteful in chip ram and cpu speed. I used the MagicWB 8 color palette and found it a nice compromise between speed and appearance. In fact I personally think the "Amiga look and feel" is best exemplified by MagicWB, Magic menu, and MUI in a 4:3 screen mode.
Actually, I'm a little over eye candy on the gui, now just run the stock 4 color workbench: after all the gui is just a means to communicate with the computer. Most people still read the icon label text, and don't rely on the icon pictogram to determine what the icon represents, with the icon just representing the "clickable" region. In that case, pretty icons are pointless and possibly distracting.