The Copic Airbrush system
First off, this is literally one of the more fun tools and techniques I've played with in a long time. Not only can you have a blast painting poppers, but the Copic Airbrush system can be used to paint crease flies...
![Smallmouth bass on crease fly popper]( "Smallmouth bass")
![crawdad fly pattern crawfish craw]( "crawdad")
![bass popper fly pattern]( "bass popper")
![bluegill popper fly pattern yearofthebluegill]( "bluegill popper")
Crawdad bodies...
And whatever else you might have in mind.
The beauty to this little system is that you have the creative power of an airbrush but with the convenience of the patented "hot-swappable" marker system. You can literally swap from color to color in a few seconds with no clean-up in between. Not only that, but the airbrush system is portable by virtue of it's "canned air" system or you can go "plugged" with a standard craft or airbrush air compressor. Plus, it's relatively inexpensive compared to other styles of airbrushing out there.
There are a few places online you can get setup. Cascade Crest Tools has a good selection of markers and accessories in one place, so you might give them a try.