If you use the brushes, please credit me, that would make me very happy.
Also, I often use shapes behind the images instead of borders, or combne those.
I'll share some here.

Basic Tips:
Use the brush on a seperate layer.
Use many layers. Duplicate one if you want to experiment.
You can reduce and increase the opacity of the layers.
You can use the borders in several colors by changing the color in the toolbar.
Don't distort the motifs. Keep the proportions intact.