Custom Fields: Add HTML or IMG

Please add support for a Custom Field option for HTML and/or Image.

Some custom fields require additional explanations or information.

For example, one of my custom fields asks the user to select a product option. I would like to include an image of the products available so the user can see what they are choosing.

Another implementation would be adding a block of text to explain something to the user for a form field that might not otherwise be clear.

I've learned that you can pretty much do this by using the "Message" field type.