Here’s a good idea from Family Fun Magazine: turn a plastic dinosaur into a kid-friendly toothbrush holder.
Pick a hollow dinosaur toy (they can often be purchased for about $1), trace the size of the toothbrush on the dinosaur, and use a craft knife to cut out the hole. Make sure to cut a hole all the way through the dinosaur for easy cleaning. Voila! A fun way to make tooth brushing more inviting for your kid.