Wabashwheels:
Look at the weathering on those things! I'm not sure it would be important what your base blue was. Just pile on the dustings and washes. Rick.
Yeah, no kidding, a quick spray with intermediate blue, some off-white on the bottom, spray it all over with some clear super sticky, and take handfulls of powdered sand and coral dust and throw at it!! Then all-but cover the white with any kind of nastiness you can think of.... oil, fuel, grease, dust, grease mixed with dust-Hey, you can get this off an old car that's been leaking stuff for years.