Plywood in my kitchen what can i do so it looks nice

stain, paint, wallpaper ... if you mean the walls, I'd paint w/ something that can withstand cleaning -- if the countertops, do a mosaic, tile, or use a fake granite paint product .

I assume it's the floor? If so prime and paint with appropriate paint,but better yet if it's got good grain then sand and stain and then put a finish on it after all it is wood.😏 Someone on this site did just that and it looks great. Another technic that I really want to try is the paper technic,it makes your floor have a weathered almost distressed leather look. Beautiful! Also on this site.

What are you using the plywood for? If you want the wood grain to show just apply a stain and sealer. If you want to hide the stain then prime, paint, seal. Depending on the use of the wood you can wallpaper, decoupage, stencil, or any kind of decorative treatment that you prefer.