Here's an updated list of all of the Southwest special schemes as of 3/4/2024: (painted, no decals or stickers)
Shamu I: 5/23/1988 N334SW 737-3H4 retired 12/11/2012
Shamu II: 5/30/1990 N507SW 737-5H4 retired 10/10/2013
Shamu III: 9/7/1990 N501SW 737-5H4 retired 6/26/2012
Shamu IV 7/2005 N713SW 737-7H4 repainted 12/2014
Shamu V 8/2005 N715SW 737-7H4 repainted 12/2014
Lone Star One: 737-3H4 N352SW 11/7/1990 retired 5/17/2016: 737-7H4 N931WN 7/15/2016, repainted heart 1/16/24: 737-8H4 N8660A 2/21/24
Arizona One: 737-3H4 N383SW 5/23/1994 retired 9/29/2017: 737-7H4 N955WN 2/27/2018
California One: 737-3H4 N609SW 8/11/1995 retired 2/10/2017: 737-7H4 N943WN 2/9/2017, repainted heart 5/31/23: 737-8H4 N8653A 7/22/23
Silver One: 737-3H4 N629SW 6/6/1996 retired 8/14/2017
Triple Crown One: 737-3H4 N647SW 6/9/1997 repainted 3/28/2015: 737-7H4 N409WN 5/22/2015, repainted heart 2/21/24: 737-8H4 N8681M 3/20/2024
Nevada One: 737-7H4 N727SW 6/21/1999 retired 11/4/2022: 737-8H4 N8646B 5/16/2023
New Mexico One: 737-7H4 N781WN 8/30/2000, retired 6/17/23: 737-8H4 N8665D 7/13/23
Maryland One: 737-7H4 N214WN 6/14/2005
Herbert Kelleher: 737-7H4 N711HK 7/8/2005 retired 3/11/2022: 737-MAX 8 N871HK 11/15/2022
Slam Dunk One: 737-7H4 N224WN 11/3/2005 repainted blue 10/11/2010
Gold retro: 737-7H4 N714CB 4/10/2007 retired 5/13/2022
Illinois One: 737-7H4 N918WN 4/14/2008 returned to lessor 11/20/2020: 737-8H4 N8619F 9/26/2022
Florida One: 737-7H4 N945WN 4/23/2010
Colorado One: 737-7H4 N230WN 8/22/2012
Penguin One: 737-7H4 N280WN 6/20/2013 repainted Missouri One 4/15/2015
Missouri One: 737-7H4 N280WN 4/15/2015
Tennessee One: 737-7H4 N922WN 2/22/2016 repainted heart livery 2/22/2021: 737-8H4 N8620H 9/3/2022
Louisiana One: 737-7H4 N946WN 3/7/2018
Freedom One: 737-8H4 N500WR 6/18/2021
Colleen Barrett: 737-MAX 8 N872CB canyon blue retro 11/23/22
Imua One: 737-MAX 8 N8710M 4/29/2023