Come up with your own Mongekyo Sharingan power (i.e. Kamui, Amaterasu, Isanagi) and remember that a large part of what makes a power great is its consequences/limitations/weaknesses. : r/Naruto
600 Mangekyou Sharingan ideas
mangekyou sharingan by naruto-art-maker on DeviantArt
Random Mangekyo Sharingan 4 by IndigoLucifer on DeviantArt