Another great lady on this site had sent me some tiny terry hair bands to try and they were great.
I found a pack of 200 for $1.00 at the Dollar General in all kinds of colors. I even try to match the color of the hair band to the thread and they are fantastic. They just slip right over the bobbin beautifully.
I embroider so I even put all the white terry bands on those bobbins to distinguuish them.
And the price fit me better than the fancy bobbin covers.
Karen

I just keep some in a plastic box...but I do have a couple of the round rubber ones that you just stick the bobbin in and you can see what color they are. I haven't tried the hair band ones but if it ever comes to that I will! Keep the cheaper version ideas coming!

Bobbin savers are the best if you drop it you won't lose the bobbins all over the floor. I have one for embroidery and regular sewing.
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I use a 7-day pill container that has straight sides. Each day holds 4 bobbins securely and I can see the colors of the thread through the lids and which days have empty bobbins.

ditto!

go to the dollar store, and buy a package of the tiny pony tail holders for kids. they are amazing!

Bobbin buddies http://jhittlesewing.funoverload.com/sewing/catalog.php

I use the bobbin donuts. It will hold lots of bobbins. there are 2 colors (red,blue and purple) I have a different color for each machine so know which bobbins are which. thread stays on bobbins. Can drop it and they don't come out. I also bought one with master piece thread in it for applique many colors to have for traveling.

Goody Ouchless Ponytailers. I also use them on my embroidery thread and any other thread that doesn't have a thread holder.

Sorry, double post.