color contact lenses for myopia and astigmatism?!

Right, Freshlook colorblends are the only available toric colored contact lens and the astigmatism prescription is not strong enough for you. Sorry, they are just not available. That is why most colored contact lenses only do have one number - because most just aren't available for astigmatism correction.

But you also should know that you cannot just go order whatever type of contact lenses you please on whatever website you want. It is ILLEGAL and called "practicing optometry without a license". Contact lenses are a medical prescription and need to be specifically prescribed by a medical doctor (optometrist) for you. Each brand or type of contact lens has a different fitting set and different parameters that need to be safe and fit your individual eye. This is why you must have a contact lens fit and a yearly contact lens evaluation with the eye doctor.

We go to 8+ years of college to be an eye doctor; yet people want to trust themselves by randomly ordering the "pretty" contact lenses online on their own. That's a good way to damage your cornea.

The first number is the spherical correction your eye needs. The second number is the astigmatism correction. The last number is the orientation (axis) that your astigmatism is at.
OD -5.25 -2.25 x 010 --> -5.25 sphere with -2.25 astigmatism correction at axis 10
OS -4.75 -2.25 x 170

I am an optometry intern.

FreshLook Colorblends Toric contact lenses are the only color CL's that correct for astigmatism. Unfortunately they only correct up to -1.75 of astigmatism, less than what you require. Also, you will need to be fit in any CL's by an optometrist or ophthalmologist before ordering the lenses. The x010 & x170 represent the axis of the astigmatism, or how your eye's astigmatism is oriented.

I'm an Optometrist

The previous two answers have covered it fairly well, but I also wanted to mention that if you order colored contacts online, the supplier will call your eye doctor or send them a fax and tell them what prescription and type of contacts you ordered, and how many boxes. If you order the wrong kind or prescription, or order off an expired prescription, your doctor's staff will just deny the order and the site will e-mail you and tell you that you can't order them.

Optician

Another quick tidbit that you might want to be careful about...I tried color contacts many years ago (must have been early high school), and couldn't wear them. I have large pupils and could actually see the pigment of the colored contact in my vision. I'm sure colored contacts have changed quite a bit since then, but it could be an issue.