This is how I did it.
1. Wrap the box in craft paper or old Christmas paper turned inside out.
2. Fold a small piece of your paper to make the back of the stove for the knobs.
3. Cut a square out for the oven door using a steak knife, box cutter, or scissors.
4. Use string, pipe cleaner, anything you can find to make the oven handle. Punch small holes using your knife and tie a knot in your oven door material and slide the to-be handle through to the other end.
5. Paint, use marker, crayon, pen, or whatever you have on hand to make the stove eyes, knobs, and oven window. I used paint and used both my fingers and a paint brush. You could even have your child join in for an afternoon activity.
That is all there is to it. This project took me 40 minutes and $0. My daughter plays with the stove everyday and it can be easily moved from location to location unlike expensive store bought versions. I can even pack it up to take to grandma's or stash it in my daughter's closet with ease.
The part my husband likes the most about my creation is the clean up. Not only did my daughter lack a place to play with her kitchen toys, but we didn't have a place to store them. Now when she's done, we ask her to pop all the toys in the oven and viola! Instant clean up and organization all in a simple "package". :)