Well, for now I use some small curtains that we don't use on the windows to throw over all of mine. The curtains are too short for our windows, but they make a useful dust cover. They are bright pink and very ruffley. My aunt gave them to us.
I like your covers much better! I really, really like the second one, but both are great!
It's been on my to do list for a while now (to make a real cover). I almost bought a pattern with a pic of an old machine to applique on the front.