I have tried a lot of optometrist-branded lenses in the past (pretty much tried every brand they had lol), and so far all of them are 'natural looking', some more showing than others but still having more than one color in them or not having a black ring around it.
Your best bet would be with what Ani_BEE suggested, pinky paradise has a very nice selection and power as well as been fairly cheap and the shipping is only around $5 or whatnot. Just be sure to chose the correct diameter, as 14.0 may be too small if you have big eyes and 15.0 may look too big depending on what you want.
If you don't want to buy from them though, there's also Clearly Contacts (http://www.clearlycontacts.ca
) that may have some.
Splash of Color 2 are "natural looking" but with a VERY intense color (meaning not so natural looking lol). Otherwise they used to have Halloween contact lenses which were more 'fake looking', but I have no idea where the link went on their website so...