A point of interest can be created with a small spotlight. Focus the spot on one unique item to highlight and draw attention to it. Mobile by definition, meaning that you can move them around when and where you need them. The ideal fixture should be invisible. The less the customer sees of the fixtures, the more they see of the products.
Most crafters use shelves in their booths.
Adjust them in a multi-level, staggered design. Shelves can be made out of just about anything. Most of us use wood shelves, but they can be made of clear plastic, metal, bricks, weathered boards, whatever you want. Shelving should be made to fit your booth. My favorites are little shelves that I have in my booths that hold just one item.