As an AI language model, I do not have any way to determine the popularity of designs for outdoor fire pits in Spanish villas. However, some popular designs for outdoor fire pits that you might consider include:
1. Circular fire pit with a stone or brick surround
2. Fire pit in the center of a courtyard with built-in seating around the perimeter
3. Modern-style rectangular fire pit with sleek metal surround
4. Rustic-looking fire pit made of stacked stone with a fireplace-like chimney
5. Sunken fire pit with a mosaic-tiled surround and a canopy overhead for shade.
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