A cactus plant of your choice. Buy a healthy plant of average size. Very small plants may sometimes take years to grow to a standard size.Most of the cactus plants love sunlight, especially those with spines.They should be placed in direct sunlight.Others, which do not prefer sunlight, should be kept in shade.
If you want to keep a sun-loving cactus indoors, it is advisable to place it near a heat lamp.