Bumpy Space Sphere (not to scale?)
Not going to lie, this is extremely slow, but the high quality is worth it in sulfurous.
This works by using a spherical coordinate system. Given the row and column of the picture, the two angles phi and theta are found, which combined with a radius give each coordinate.
Best of all, you can stick any photo in here and any heightmap so long as you specify the width and height (and of course, make sure the photos are small enough that Scratch can save them in the lists).