Tiny miniature Vanda species. These can grow much cooler than your typical Vanda, and stay very small. Tiny purple flowers. 

A little bit difficult to grow, we grow them mounted and in bright light. Water frequently and don't let the plants get above 85 for long periods. 

Bloom size micro-miniature. I suspect the ID on these is wrong, and they are in fact the easier growing Ascocentrum pusillum