Hi Joanna, you can actually buy formica/laminate counter top painting kits now! Here's a tutorial: https://www.uglyducklinghouse.com/i-painted-my-kitchen-countertops/
Thank you , so much, it seems very difficult to do it, I’ll give it a try, 😊
To paint Formica countertops, you'll need to use a strong durable paint like laminate paint, interior acrylic paint, or a two-part epoxy paint that's water based. Once you have your paint, apply 2 coats of a primer, which will help the paint adhere to thecountertops. Let the primer dry after each coat.
They sell a roller that looks like a wood grain that might work! Here's something that might work: https://amzn.to/2wlPsSC