How do I makeover bathroom floor?

Hi Staci. I'm Cindy. We moved into our current house almost 3 years ago. The main bath floor was UGLY. We couldn't afford much so we agreed to fix it temporarily. We laid peel-and-stick tiles right on top of the tiles already there. We were going to make a permanent fix a few months later. Well, it's going on 3 years and those peel-and-stick tiles still look great. So, that is what I am going to recommend for you. They are inexpensive and easy to install. Best wishes.

Yup, I agree- peel-and-stick tile. We did the same as Cindy- laid peel-and-stick tile in our bathroom as a temporary solution nearly 3 years ago. We love it! I did groutable because I like that look. It was an easy DIY and very inexpensive. If you are interested, here is a post discussing how it has held up: https://www.avenuelaurel.com/2018/03/27/groutable-peel-and-stick-vinyl-tile-how-we-like-it-2-years-later/

It depends on what's already on your floor, and what kind of shape it's in. Knowing that would help people give you better advice.

Twenty or more years ago I trompe l'oeil painted a vinyl floor to look like tile. The tile I wanted did not exist, so I had to use paint to achieve what I wanted. First I primed it, then I painted it with latex and acrylic paints to look like tile and grout. Then I put about 16 or more coats of Varathane on top. It is still gorgeous after all this time and looks just like grouted tile, but it is just a sheet of vinyl. You can paint over just about anything.