Good Questions: Lampshade Suggestions?

Hi! I have a lampshade crisis I'm hoping people have suggestions for! I have a pair of small, round blue glass lamps I got on ebay. The glass part measure about 5 1/2 inches, and the part for the lightbulb measures 2 1/2 inches. I've been searching for appropriately sized shades with no luck! I'm thinking a clip-on shade would be best since there's no harp and finial, but the shades are either too tiny, (made for for chandeliers,) or too big. I would really appreciate some ideas! Thank you so much in advance, Deborah

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