As Mike said, those things are in the works.

But in case you can't wait. There are two ways to do what you ask. The first is to lay down a base layer of one color, and then to put the second layer over it. It's best to put the second layer on using the "Windex Method". Instead of me re-typing how to put on monokote with windex I'll put this link up. This is an excellent "how-to" on doing it with windex, [link=http://www.rcuniverse.com/forum/m_603331/anchors_603331/mpage_1/key_flag/anchor/tm.htm#603331]Applying monokote graphics with windex.[/link]

The second way is to actually join your two color pieces before you put them on the plane. Get a mirror or a sheet of glass to use to join your pieces. Lay down the first piece on the glass and then position the second piece overlapping the first (about 1/4" overlap) and then use a covering iron to seal the two pieces together. Then you can apply those to the plane as you normally would put monokote on.

Hope this helps

Ken