Yes, I store single and double dropper rigs ready to go.
What I use is a 5"X3" foam block of 5/8" foam (you can glue together several layers of sheet foam to get the depth). I stick round headed hat pins in the ends of the block (usually 3 or 4). With a loop at one end of the pre-rigged flies, and a fly at the other end, I loop over a hatpin head, wind the line around the foam, and hook the fly into the foam. I can easily get one rig per hatpin without tangling up.
They sell this kind of rig holder for about $5 but you can make MANY for that price.