This is a Sphere intersected with a Gyroid.

This was created using ShapeJS which is an Open Source language for creating 3D printable objects. Try it out at shapejs.shapeways.com

Here is the source code. Add a File Input to the ShapeJS console, this code will gyroidize the object.

function main(args) {
var baseFile = args[0];
var grid = load(baseFile,0.075MM);
var intersect = new Intersection();
intersect.add(new DataSourceGrid(grid, 255));
intersect.add(new VolumePatterns.Gyroid(10MM, 1*MM));

var maker = new GridMaker();  
maker.setSource(intersect);  

var dest = createGrid(grid);  
maker.makeGrid(dest);  
  
return dest;  

}