to go a lil further into breeding and the crossing of different betta splendens. if you have a blue or red male veiltail and any colour and tail type female, the fry will have a large chance of being mostly blue or red veiltails. those colours (blue, red) and the veiltail gene (for lack of a better wording) are the most dominant of the b. splendens when it comes to breeding. it gets more complicated once you talk phenotypes (i think thats the word to use), lol.
vacountryboy, do you have room and the resources to care for the potential hundreds of fry you will end up with? that is a major question you have to ask yourself before you even attempt to spawn them. i don't mean to discourage you from the awesomeness of breeding and raising something yourself, but you have to be very critical of the situation and be sure you can do it before you start. i'd start collecting lots of big jars now if you are!