Women are excused from their obligatory prayers while menstruating.
It gets even better in Ramadan, because we get a break from fasting.
Aaaand, last but not least:
Nail polish can nullify your wud?hu (a ?washing? ritual we have to perform before prayer), and since you don?t pray while menstruating, you?re free to drown your fingers in colorful liquid when liquid of the same color is pouring out through your legs.