Design 2 moving images for our website

I would like a Caterpillar, which would crawl around pages on our new website. Also A Butterfly, which would fly from one location to another on certain pages. Some musical notes could hover around them both. Both would be in line with our current logo. (a Caterpillar Head) - so essentially we just need the body designing to fit the logo. It needs to be visually appealing for a children's music website.