Does anyone sit there? Maybe some pillows, or a cushion?

Well, 30" is way too high for seating. What type of material is the bay window deck?

Why is 30" way too high for seating? How high is a bar stool?

BOBBI, 29" to 32" for bar stool height :>) so, not too high.

Would love to see that area be functional and fun. A bar height table/game table with a couple of stools.

Olldbobbi, regarding your comment, I was imagining a place to sit and remove / put on shoes. I've seldom seen or sat on a bar stool without a footrest. @ 30" high, your feet are going to dangle. It's not comfortable seating height, is what I was referring, although I sit on my kitchen counter all the time.

Kitchener64, how about a theme. Miniature beach theme, or desert theme etc...

Also, can you access it for storage?

If you must put something on the ledge of a bay window some people think it feels empty and that's okay it's your thing. Make sure it is a piece of glass art like a modern form piece with colors that look great when the sun shines through it. This way it still keeps the window with an open and light feel and it is an object that will create many fascinating colors and designs through out the day.

Thanks for your comments. No to storage, too high for sitting. Deck is painted wood. No furniture in front, all furniture arranged to face outside, privacy not an issue. Like the idea of glass art.