It is a mystery... I believe they are the monotone ones, I have 1 as well... fewer than any other though.
Some of the collection... http://forums.kidrobot.com/viewtopic.php?t=109734
WTB: CLEAR MAD'L spending maddd $$!!! or/ and common mad'ls for customizing.
Good Deals with- bubblegumking, DreVanFuzin, baronacasino, MisterKart, brooks55, c-money, drinkh2so4, NonVenomous, tavaro, drilone, Slack, louleeboo, tvsinny, obeyKevin, dodgrr, Lucky13, mzkayDi, Quest1, lalolo, MaD, djfohm, dudegb, mourningwd, phazeonedj, Adunn, DannyDesign, MaD, Graf-Toyz, uberboy, SpawnNmunny, zephr, zombiemonkie, highland19, sleepboy, TungTLe, SQUEE, onyxturtle, DunkMax, bzx002, toemah, selekta_nips, dubsm177, swiffer wet jet, uberboy, Squidnik, qwest1mark, Wtfunks
Items for trade thread- http://forums.kidrobot.com/viewtopic.ph ... 49#1404549