Paint mini canvases, put together in square, use squeeze bottle to swirl white paint over all of them. (middle three diagonal = same color; two top diagonal=same color; two bottom diagonal=same color; top corner on color, bottom corner one color)
Add depth to spray bottle art by mixing touches of gold or silver leaf in with other colors. After all colors are added to the canvas, apply the gold or silver leaf to the surface using leaf adhesive and a small detail paintbrush
Beautiful cut-out canvas. You could leave them see through to see the color of the wall behind or it'd be easy enough to put craft paper behind which would be easy enough to change with the seasons or new decor.