Like for example, what would you get if you bred a blue laced red wyandotte roo with a golden laced wyandotte hen?
Blue Laced Red is not an officially recognized Wyandotte color/pattern, it is more of an unofficial color/pattern. Gold Laced is recognized. I would not consider either one crosses.
There is a lot more to making a Wyandotte a Wyandotte than feather color/pattern. Number of toes, comb type, eye color, skin color, ear lobe color, and many other things with body conformation being extremely important. If you cross those two you will get a chicken that looks like a Wyandotte though the feather color/pattern might not be recognized, provided they meet the other requirements of being a Wyandotte. A lot of chickens sold as Wyandottes don't really meet those standards. If you cross another breed with a Wyandotte you almosr certainly will get a chicken that does not meet the breed requirements of either breed.
If the birds you are breeding are pure for the color/pattern (no recessive genes hiding under dominant genes) you can predict with great certainty what colors/patterns you will get. It doesn't matter if they are the same breed or different breeds as you are only talking about feather color/pattern and not the other characteristics that make a breed. When you cross pure color/pattern birds you get a bird with the dominant and recessive genes really mixed up. The dominant genes will suppress the recessives so you can predict what you will see. The more differences in the color/patterns of those birds the more those genetics will be mixed up but you can still predict what colors'patterns you will see.
If you cross the offspring of that cross you can get a really wide range of possibilities. It depends on which recessives and dominants get passed own and how they intermix.
Lets do an easy one. If you cross a Speckled Sussex (red mottled on the chicken calculator) with a Black Australorp (Black on the chicken calculator) you get black chicks. If you cross one of those offspring back to its black parent you will again get black chicks. If you cross one offspring to the Speckled Sussex parent you can get six different colors/patterns for the pullets (Black or black speckled, two different versions of red without mottling and two different versions of red with mottling) and four possibilities for the cockerels (Black, Black mottled, and black patterned red with and without mottled).
But if you cross two of the offspring you can get 14 possible color patterns for the pullets and 10 different possible colors/patterns for the cockerels. I'm not going top list them all out but this is a pretty simple cross to start with. There are some starting points with the colors/patterns you could start with that will give you a lot more possibilities. And this ignores starting with different comb types, ear lobe colors, number of toes, eye colors and a lot of other differences not related to feather color/patterns.
What do you get when you cross crosses? Chickens. With the potential to have a lot of differences in the individuals.