Alpha version, may still have errors.
These are basic two-level isometric tiles with 30-degree slopes and internal borders, sized 64x64 pixels. Useful for building your own tilesets on top of them.
For separate floor and wall tiles, see my other upload:
https://inkscape.org/~apmbcn/%E2%98%85two-level-isometric-floor-and-wall-tiles-with-30-degree-slopes
For shading masks to use with these tiles, see:
https://inkscape.org/~apmbcn/%E2%98%85two-level-isometric-tile-shading-masks
Tiles with 45-degree slopes available here:
https://inkscape.org/~apmbcn/%E2%98%85isometric-tiles-with-45-degree-slopes