We laminate our individual signs. Then we attach then to the cart surface. Lamination keeps the sign from getting wet or dirty. I use Printmaster Platinum 15 to layout signs and use a digital camera. I like the postcard size signs. Big food pics and readable fonts is important. I like to edit the pics and drop out the background. I tend to photograph the food on a white surface (usually the white Corian serving counter. If using a group of individual pictures to combine into one, make sure you keep all items to the right scale. If you put text over a picture (even just a little bit), outline the text with white to make it easier to see.