The Feedback Designer Module for DotNetNuke can easily have the text buttons replaced with images. These images can simulate buttons.
To make the change you simply:
1. Login as Host or Admin to your dnn site
2. Configure the module
3. from the menu, select “Modify Look and Feel”
4. From the Send / Reset Settings select “Image” from the Text of Button options
5. Select your images from your site directory
6 Save your changes