Here is a very unique fish, this is a female crowntail (CTF). She is orange and has double rays (DR).
Not all female betta are dull. Check out this Half-Moon Black Green Lace ( full mask ) female.
Excellent Doubletail Female Betta by Dan Young. 1st Place, World Halfmoon Expo I 2002
This is a female Betta. They don't have nearly the same color or fin length as their more flamboyant male counterparts.