Sprite Stitch Board!

I made a great Mario cross stitch for my brother for Christmas. I want to package it in a unique way and thought about putting it in a flower pot that I paint green and topping it with a Mario Piranha instead of a bow. I have red and white fabric, so I would like to just stitch it up by hand rather than try to crochet or knit one. I'm kind of at a loss for how to make the pattern, though. I can picture it in my head, but I don't necessarily know how to transfer that to something I can stitch. Does anyone know of a good pattern or how I should go about making one? I want it to be something that looks nice and could go on a shelf. My few quick test patterns haven't worked out well.

Thanks for any help or advice you can offer!

What do you need a pattern for? The mario or the piranha plant. And could you post some pictures as visual aid? Like the mario for example.