Orange oxide, orange mica will give you orange.
Possibly turmeric or carrot root powder. I've never used them in mp, only cp. So they may just turn brown in mp. Plus too much turmeric can stain.
Orange peel powder turns brown after a while in mp.
There's also:
Tomato powder
Pumpkin Powder
Paprika (but this can be an irritant to the skin)
The tomato & pumpkin may turn brown in mp also. I've never tested those.
Are you the one that tried the orange peel and flowers in the soap?
You could instead of putting them directly in the soap, infuse them in an oil. Then mix the oil in the soap. Which may give you a light orange.