found this in a German E24 forum and thought it might be interesting for some of us:

if you want to paint M-colours:
blue GLASURIT-BMW 4000
bright blue GLASURIT-BMW 5002
red GLASURIT-BMW 353

for a web site (HTML):
bright blue - 0F81CA
blue - 263588
red - A81317


HEX:
0 138 201 (Hex: 008AC9)
43 17 90 (Hex: 2B115A)
241 26 34 (Hex: F11A22)