The racial pick PLANET QUALITY offers two choices:
3pts). Green Thumb +5% quality bonus -- one bonus tile for every twenty
8pts). Magical +7% quality bonus -- one tile for every fifteen
The new GC2 tile system povides about ten tiles for a worthy planet, 12-16 for a good planet, and 19-26 for an excellent planet.
It seems to me that these values aren't useful enough to try this racial pick, and so I offer this as a possible thought for upping the percentages:
For Green thumb (3/10pts), give the player one extra tile for every ten; (+10%)
For Magical (8/10points), where the player has spent almost all their race points to achieve this one special ability, give the player two extra tiles for every ten (+20%)