This panel has lots of borders that make it bigger. It also looks a bit like water. Not too 'girly' either, and it's a free pattern.
If you scroll down, just below the add to cart bar is a download bar. When you click on it, the pdf file automatically downloads to your computer. It has all the sizes of all the blocks and borders.
Maybe you could customize it to fit your panel?
https://www.equilter.com/pattern/1056/ocean-paradise
more panel enlarging ideas here:
https://www.equilter.com/pattern/category/1