I got these two bulbs today
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The top one is 24-5050 (360 lumens) and shines 360 degrees, $9.99.
The bottom one is 16-5050 (240 lumens) and shines down, $11.99.
I placed one bulb in each side of a double fixture, and they appear to have nearly the same amount of light output. Compared to my original 921 bulb, they are about the same, possibly slightly more light output, and less yellow than the 921. I wouldn't really call the light "blue", just really more white. The bulb-type one in the top picture has the advantage of 1) being cheaper, and 2) not having to worry about keeping it stuck to the ceiling of the fixture.
I also got some of these from ebay (10 for $12.89)
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but they didn't fit into my fixture. I dremeled one down until it fit, then lit it up for comparison. It was much less bright, and very green. I will not be using these.
I will take some pictures later on tonight when it gets dark. I'll post those later. I still have 4 or 5 more bulbs coming from China which won't be here yet for awhile, but so far, I'm happy with the 2 in the top pictures.