start introducing fully terraformable sims ( keep the regular as well )
as well, more varied land terrain, white sands, more colors (Crystal Shores is definitely different). Coral colored beaches, different colors of water variations (turquoise, dark and light blues), sand desert land, red lava land, some people might even like black land (yuck

Basically new colors and textures
In short new colors, textures, variations and maybe even themes also (as always, with no covenants) .
Too much green, browns and granite
