Do you mean a shelf with a groove in it to hold decorative plates or are you asking about something else? Pinterest has lots of ideas for shelves over windows:
Our recently purchased home has two fish ponds, currently occupied only by frogs, which we enjoy. The ponds are filthy, though, filled with years of leaves, mud, and...
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I have tried the crushed red pepper in the bird seed, and have tried putting vaseline on the pole that holds the feeders....any other suggestions? I will at times hav...
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Do you mean a shelf with a groove in it to hold decorative plates or are you asking about something else? Pinterest has lots of ideas for shelves over windows:
https://www.pinterest.com/explore/shelf-over-window/?lp=true
Have you considered hanging them?
https://www.pinterest.com/pin/475833516853123052/