Is yeast supposed to look like this?

I harvested some yeast from the end of a cantillon bottle hoping to cultivate some more of it to use for a beer in a few months. After 2 days or so on the stir plate, i crashed it and when decanted, this is what I got. It doesn't look like any yeast I've had before..

Looks just like it to me. Stand it up and put it in the fridge a few days, it will separate and look just like store bought

It's brown though. I've always seen tan yeast.

Getting a good culture from dregs always seems to be just the luck of the draw in my experience. No mater how careful I am half the time I end up with microbial contamination. To really know what you have you'll need to look at the morphology some way. That could be with a microscope and/or plating it. But you could also make a 1 liter test batch and see how it comes out.

Here is information on plating:
http://www.woodlandbrew.com/2012/12/isolating-single-yeast-strain-by-plating.html

You might also consider acid washing it and giving the stir plate another go:
http://www.woodlandbrew.com/2013/03/acid-washing.html

Whatever is in that vial doesn't look copacetic to me.
Just my opinion, but like you said tan is the correct color. That looks septic to me.
I'm not insulting your brewing skills. Your beer may be terrific, but that pic looks unsettling.

Good Beer should be Good AND Cheap

Does look a bit funky to me too.

Since Cantillon is a Lambic, you have more than just yeast in there. Quite possibly the yeast is dead.

Best way to keep and grow that is to get a small amount of low abv beer (quart, half gallon, or gallon), toss that in it, stick on an airlock and forget about it for 6 months. A stir plate isn't going to help the bugs.

Then when you come to use it, decant (and drink if ok) the beer and add the cake to a new batch along with some fresh Belgian yeast.