Vena Cava was one of ten labels with a Spring 2007 show made possible by UPS, which sponsored a showcase for young designers in a special section of the Bryant Park tents. Unlike their fellow "Hub" dwellers, however, Vena Cava designers Lisa Mayock and Sophie Buhai opted for a presentation over a runway show, with a quirkily conceived setting that echoed the whimsy of their last outing. The four rooms that had been the conceit of their fall show were replaced this season by three lawns, peopled by groups of characters with names like "the daydreamers" and "the misfits." Charming, maybe, but not strictly practical: It's tricky to get a sense of what clothes look like when they're being worn by models lying prone on Astroturf. Nonetheless, there were pretty, wearable offerings, including a mauve dress with fringe details, an evening gown with a deconstructed seam, and a brown leather jacket lined in an original printa Vena Cava signature. Only a small step forward from last seasonmost of that in the decorative detailsbut enough to keep the loyal fans happy.