[Luvian]

If I were you, I'd probably just delete those bars and put a colored background in those cells.

You can always create a small rectangular cell on top andbotton of the bars and put some pictures with rounded edges, if you want them round. You should ad some text or images in those bas, otherwise they are pretty useless.

If you really want to keep them like they are, you could create a transparent gif and put it instead of the missing image.