.html form that shows previews of images

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I have an .html form processed with .php that will show previews of text that is processed and allows customers to go back and make changes, but how do I have a form that will allow customers to select "images," which when all selected, can be put together to form a quilty, which the customer then previews?

For instance....

Overview: online customers purchase custom quilts.

Customers should be able to use .html form to customize the quilt. The customer should also be able to select options such as

- size
- color
- theme
- custom knitting patterns
- pattern
- images

Each option carries a price, so the .html form should be able to keep a running total of the options and price.

Once customer selects all the desired options, she should be able to see a preview of the quilt and the current price for the quilt with options.

The customer should then be able to click a button to return and make changes or to go forward and finalize order.

When the customer hits the "complete order" button, she should be forwarded to paypal to complete the payment.

Note: I have all quilt images and patterns as .png files. They are hosted on my server and will be used to create the preview.