These are the color codes for events when embedding multiple google public calendars on your site.
Pink - %23B1365F
Fuchsia - %235C1158
Red - %23711616
Crimson - %23691426
Orange - %23BE6D00
Orange Red - %23B1440E
Red Orange - %23853104
Burnt Orange - %238C500B
Brown Orange - %23754916
Gold - %2388880E
Goldenrod- %23AB8B00
Darker Goldenrod - %23856508
Pale Green- %2328754E
Lighter Green - %231B887A
Green - %2328754E
Forest Green - %230D7813
Olive Green - %23528800
Jungle Green - %23125A12
Another Olive - %232F6309
Another Green - %232F6213
Sea Green - %230F4B38
Golden Olive - %235F6B02
Green Gray - %234A716C
Olive Gray - %236E6E41
Dull Navy - %2329527A
Standard Blue - %232952A3
Blue Gray - %234E5D6C
Blue Steel - %235A6986
Another blue - %23182C57
Dark Blue - %23060D5E
Sea Blue - %23113F47
Violet - %237A367A
Purple- %235229A3
Purple Gray - %23865A5A
Purple Brown - %23705770
Deep Purple - %2323164E
Magenta - %235B123B
Another Purple - %2342104A
Yellow Brown - %23875509
Brown - %238D6F47
Nice Brown - %236B3304
Black- %23333333