I just used the screenshot capture and dragged around one of the stock images to guesstimate a good size...I came up with 30x30px, and that actually fit very well.
You could probably go wider depending on your situation, but I think you would only have room to go maybe 5-10px taller.
Also, I used a light gray to dark gray gradient to simulate the stock images. The application automatically applies the blue glow when you click.
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