Breeding. What would you get.

If you bred to bays what possible colors could the foal be. Someone told me it would be possible to get a perlino. Is this possible?

While I'm no color expert, I can say it really depends on what color (and the genetics behind it) you breed to a bay to get a color. Both parents contribute genes that decide the final color outcome.
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But to have a perlino both parents would have to have at least one cream gene, making them buckskins instead of bays correct?

They would have to have a creme gene somewhere in there to have a perlino. I think your most likely outcome is going to be a bay with two bays because that gene is going to be dominant.

Thats what I thought. My friends was trying to tell me breeding 2 bays would give you a chance of getting a perlino but I told her that both parents would have to be buckskin to have a chance of a perlino foal if the base colors of the parents were bay. She also said that the creme gene could be recessive and not show up in the bay coat but I thought it the creme gene was present it would ALWAYS show in the coat color.

You are exactly right. The creme gene is dominant.

You would get bay, chestnut, or black. But there are modifiers that would change the colour a bit. My friend's TB mare's parents are both bays, but she's a flaxen chestnut. (But after reading things on here, I kind of wonder if she's a silver bay, but I'm not sure if those exist with in the TB breed..)

Yeah I thought you could get a black, chestnut or brown out of it but wasn't sure. So I didn't want to say so.

I highly doubt she is a silver bay.

You can get a flaxen out of two black based horses. Flaxen does not affect anything but red horses so it would only show on the red base.

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I often get on this site just to see what could come of different breedings. A bay is actually a black horse with the agouti modifier that fades the black to the points. If both parents have recessive red the foal could be chestnut/sorrel. If they both only have one copy of agouti and black the foal could be black, and black is dominant so if the foal got a red and a black with no agouti it would be black. If one of the parents happened to be Dun instead of bay and mislabeled, you could get a red dun or a grulla. You're right, to my knowledge if there is a cream gene present it WILL manifest, even the smoky black stud I work with (hidden cream, he's been tested) has a modified coat color, he's more of a steel gray.