Both Haraella Retrocalla and Neofinetia Falcata are good choice

and this orchids can be grown in a small pot or basket.
Haraella needs high humidity and like to receive medium light. Water it daily and temperature should be in intermediate to warm range. This orchids are small in size and its flower has a sort of lemony note with a strong fragrance. This plant blooms anytime of the year and last for 2 to 4 weeks. Nicely grown small plant can be in bloom for half a year.
Noefinetia prefers medium light level and humidity should be from 40 to 60%. Pour clean water, such as rainwater, distilled or reverse osmosis water if possible. Make sure you flush the plant regularly. Noefinetia blooms mostly from spring through fall. They produce 5 to 6 flowers on short spikes and its flowers are pure white about 1" inches, they last for one to two months. They are extremely fragrant both day and night.