Right know I do not have a color mac that can run beta and alpha software, so I made a color screenshots in Basilisk emulator. The Alpha interstingly can not run in Basilisk but in vMac emulator whic one is B&W saddly... anyway I opened the system folder of alpha with Resedit so you can se what would icons look like in color mac. Interestingly there is Mac Plus color icon that was never used, and some others like baloon hlep icons were changed too.

beta ------------------------

http://shrani.si/f/2G/hd/1mx3YF0w/picture-1.png intro alert

http://shrani.si/f/1H/Tp/qzvJUSj/picture-2.png about baloon help

http://shrani.si/f/3i/z5/4Zam4mv3/picture-3.png notice the code name in special menu

alpha ------------------------

http://shrani.si/f/r/ep/1iEMJKPK/picture-4.png alpha alert

http://shrani.si/f/1G/RK/44kKG9XH/picture-5.png ATM

http://shrani.si/f/2d/OK/5OEdcti/picture-6.png control panels

http://shrani.si/f/3J/C2/25gy5uzv/picture-9.png baloon help

http://shrani.si/f/2v/kP/1lmBzaz5/picture-7.png circles instead of triangels

icons ------------------------

http://shrani.si/f/4/qx/rrns6rw/picture-8.png icons of alpha, interesting apple menu with black background, mac plus, extensions folder ...