How do I make abstract art for behind my sofa?

Hi Valerie there are lots of abstract art ideas here:

https://www.hometalk.com/search/posts?filter=abstract%20art

Go to Habitat or a Goodwill type store and buy an existing large painting , gesso it (painting primer) and repaint. Throw paint or splatter have fun.

Look up Acrylic paint pouring on YouTube lots of ideas

I would consider to google up images and purchase material based on your preference. Stretched canvas and acrylic paints would be suggested.

Hi Valerie, here's one way to do this, use colors you love, or colors that compliment your decor

https://www.youtube.com/watch?v=6g33shACXMg