Trained on 461 matcaps at 768x768px on sd1.5.
https://imgur.com/nBGargE
You'll likely need to crop the matcap as the sphere won't reach the edge of the canvas on most seeds.
Some good positive prompts:
sphere, smooth, full circle, perfect circle, globe, perfect orb, vivid colors, gradient, simple
Some good negative prompts:
straight line, film grain, pizza, quadrants, right angle
I hope you find this LoRA useful!