Maybe someday we can complete this list?:
--Signature 100--
(Too many to track!)
--Founder/Funder series--
F27[?] Twilight Blue
F24[?] Very Orange, custom leather interior
F23[?] Signature Green
F22[?] Red
F21[?] Signature Green
F19[?] Signature Green
F17[SJ] Signature Green
F16[MT] Jet Black
F15[?]
F14[?]
F13[?] Black/RedStripes
F12[AW] Electric Blue
F11:[?]
F10:[?] Signature Green
F9:[?] Signature Green
F8:[LP?] Sterling Silver
F7:[SB] Radiant Red
F6:[LP?] Jet Black
F5:[KM] Yellow
F4:[AG] Silver
F3*:[JS] Radiant Red (*P2)
F2*:[ME] Gray/OrangeStripes (*P3??)
F1:[EM] Black
--Validation Prototypes--
VP25??: Thunder Gray; custom leather red/black two-tone interior (including steering wheel)
VP24: Arctic White; black
VP23: Sterling Silver; premium two-tone, black/red, red head restraint
VP22: Electric Blue; premium two-tone, rally 1, dark gray/light gray, light gray head restraint
VP21: Radiant Red; premium two-tone, rally 2, beige/black, beige head restraint
VP20?: Electric Blue; black
VP19: Sterling Silver; custom leather red/black two-tone interior (including steering wheel), black head restraint
VP18: Radiant Red; microfiber -- rumored to have been converted to the
Brabus Roadster
VP17: Radiant Red; microfiber
VP16: Glacier Blue; cream
VP15: ?
VP14: ?
VP13: Very Orange
VP12: Black; saddle
VP11: Thunder Gray
VP10: Sterling Silver
VP9: Electric Blue; black
VP8: ?
VP7: ?
VP6: ?
VP5: Jet Black
VP4: Arctic White; black
VP3: Racing Green; black
VP2: ?
VP1: Signature Green
--Engineering/Evaluation Prototypes--
EP10: ?Thunder Gray?
EP9: ?
EP8: ?
EP7: ?
EP6: Dark Blue (repainted?)
EP5: Yellow
EP4: Orange? Blue?
EP3: Light Blue (crash tested)
EP2: Radiant Red (first Chili Red then repainted)
EP1: Black