Black and Clear seem to be the most common spray colors but some forum threads do mention being able to find it in color as well.
Here's something redish on Amazon...

 

Basically if you order the clear, you canget the dye for it as well so have it in color

 

That pigment set is only for the dip style. Adding pigment to the clear, you would then need to find your own method of spraying.
The stuff that comes in the spray can cannot be modified, but some people have claimed to have found it in color options.... although it's not listed on the company's website.