This is one from a few years back (sold) where the background was created using very thinned down oils poured and dripped. The flowers and vase are palette knife painted. It still makes me smile :-)
Although the main technique for painting this vase was acrylic pouring, the method is most definitely (by me) assisted by my trusty palette knife which guides the paint into parts I would like it to reach. This vase is still upside down on my apple cider vinegar bottle as I can't move it until it is at least touch dry.