Da 1st retro+ color to ever get retroed was da altitude green XIII's. I believe.
Yo Ninjahood, long time no see... but I think the 2009 black Melo 12 was the first retro of a retro+ colorway. It would be the white Melo 12 if count womens and mens release of 2004. Back in 05 when I copped the Altitude 13's I told my bro-in-law I wish they had made them exactly like the 2010 pair with ballistic mesh and brighter green. I wish I could forsee some winning lotto numbers like that, LOL!! But I was thirsting for JB to bring back my Columbia and Oreo 4's, also the Chrome 8's, so I have those crossed off the list now. I'm still waiting on Mocha 3's all stupid, then Pearl 9 lows, Flint 9's, Blk/Chrome 2's and both 05' Laser 4's and I'm good as far as + colorways go.
What we got so far:
AJ 1
Neutral Grey/Metallic Silver : 2001 Japan High + 2010 Silver Anniversary
China XQ : 2007 Mid + 2013 Shanghai High (low key happy I got to score the 13')

Red "Gucci" Premeir : 2008 + 2013
Navy Canvas Strap "USA" : 2009 + 2012
White Patent Strap "USA" : 2009 + 2012
Hare : 2009 + 2015
Navy Patent Leather : 2009 (Jumpman) + 2015 DSM (Nike Air)
All White and All Black Mids and Lows : multiple times to count
AJ 3
"Pure$" : 2007 + 2010
Doernbecher Charity : 2010 + 2013
AJ 4
White/Chrome : 1999, 2006 ("Pure$"), 2010 ("Pure$")
Columbia : 1999 + 2015
Oreo : 1999 + 2015
Thunder : 2006 + 2012
AJ 5
Laney : 1999 + 2013
White Metallic High : 1999 + 2015
White Metallic Low : 2007 + 2016
AJ 6
Olympic : 2000 + 2012
Black/Chrome Low : 2002 + 2015
AJ 7
French Blue : 2002 + 2015
AJ 8
Black/Chrome : 2003 + 2015
AJ 9
Cool Grey : 2002 + 2012
AJ 11
Cool Grey : 2001 + 2010
Pink Snakeskin Low : 2001 + 2013
White/Citrus Low : 2001 + 2015 (low key tight I outgrew my W sz 13)

White/Red Low : 2001 + 2016 (Later this year)
AJ 12
Melo (white) : Feb 2004 (Wms), May 2004 (Mens), May 2016
Melo (black) : 2004 + 2009
French Blue : 2004 + 2016
AJ 13
Altitude : 2005 + 2010
I think that covers it. You guys can add on if I missed anything. I didn't add Spacejams because I consider those a OG colorway. Nor did I add OG colorblocked AJ 1 lows.