I had originally designed the ground and floor tiles in in a 32x32 box with a 2px brush, so the tiles were 16x16 in 32px tiles. It can be great to start off with this method if you want to work with a larger element and then scale down 50% for true 16x16 1px gridded tiles.
SciFi_JRPG_16x16_GroundFloor_001
SciFi_JRPG_16x16_GroundFloor_002
SciFi_JRPG_16x16_GroundFloor_003
SciFi_JRPG_16x16_GroundFloor_004
I have done this and will post the resources here and on the main page of the post.
- playerzer0
