How can I adjust slide and product image sizes in Refresh?

[Robomotif]

Does anyone know how you could change the slide image size(more than the default options) and the image sizes of the products in a collection in Refresh? We would like to create a view similar to Amazon or Newegg where you can see multiple collections on a screen without having to scroll. A code would be preferable to an app since apps have tended to slow website speeds down in the past. Thanks!