You can make your own spoke covers pretty easily. I've used Styrene/ABS. Make a compass out of a length of string, cut the disk, slit it to accommodate the wheel's dish, and zip-tie it to the spokes. Make sure you leave the flap at the valve stem, and that the flap opens the right way to prevent the induced wind from opening the slit as you ride. BTW, you can use 'for sale' signs at the local big-box hardware store as a source for the plastic, as long as they're big enough. Here's my spoke covers:
http://www.biketcba.org/TRICORR/proj...ks/covers.html
You can also make more elaborate fabric covers. I've seen lots of bent riders using these, usually made out of lightweight ripstop nylon. The fabric is the easy part of making them, so if you poke a hole in one or get it too dirty, just make more. Pack an extra set when going on tour! If you don't work with carbon, you can make clips out of something heavier, like small pieces of sheet steel.
http://www.recumbents.com/wisil/aria...wheeldisks.htm