Good luck MouseladySC. I doubt you'll get much support for that idea in this forum. However, if you provide more details, like what kind of paint you'll use - and how well it'll stand up to foot traffic or moving furniture - then you might have a better chance. It should also be something that helps keep the plywood from drying out and putting splinters in bare feet.
ps. Why would anyone want a bedroom floor to look like tiles? (I assume you mean ceramic?) Maybe you could provide a little justification, like: "It would match the trim" (or curtains).

no way, won't hold up. and you couldn't seal the seams. Splinter heaven. Unless you are buying $100 sheet furniture grade plywood.

I know a couple that finished off their floor in the kitchen with plywood. The cut it in 12x12 tiles applied it just like tile except used adhesive. Put one tile with grain up and down and the next going across. They put a light organic stain on the wood and put three coats of poly on it. Don't forget you have to lightly sand it to smooth it out so it won't spinter.But their floor looks like ice. I think it is beautiful. Sometimes people that have enough money forget some of us have to be very creative with our home improvements. I showed my brother and he liked it also and he used to build homes. We are going to fix my hallway.Then his bedroom this way. But this is just what I think of the idea.

in theory, you can use whatever you want for flooring. But I don't think plywood will hold up very well. Sorry.