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import scene

def make_oval_sprite(width=100, height=100, fg_color='blue', bg_color='grey'):
    with scene.ui.ImageContext(width, height) as ctx:
        scene.ui.set_color(bg_color)
        scene.ui.Path.rounded_rect(0, 0, width, height, height / 10).fill()
        scene.ui.set_color(fg_color)
        scene.ui.Path.oval(0, 0, width, height).fill()
        return ctx.get_image()

class MyScene(scene.Scene):
    def setup(self):  # scene.SpriteNode() wants an image name, not an image.
        scene.SpriteNode(make_oval_sprite(), parent=self, position=(200,200))

scene.run(MyScene())
# make_oval_sprite().show()

You have to cast the ui.Image into a scene.Texture. Something like that:

return scene.Texture(ctx.get_image())