I have some females with coloration like the first picture, and I don't think they're boring at all! That picture looks like an immature female as well, which is going to look more drab. Actually, females were duller than males up until recent breeding efforts brought forth more color.
However, the looks of females are good whichever way (IMO), but their personalities are the real reason to keep them. They're spunky, fiesty, and just generally fun. Also, females are in most need of rescue - I found my first betta ever, a female, shoved in the back of a shelf at petsmart.
Maybe there is something wrong with me...I am fascinated by my girls with stripes. They are young, so it's interesting to see how their colors change over time, if they change at all. The real draw, whatever color they are, is the personality and intelligence of betta fish, male or female.