The cheapest MP is a Yellow Ogrin Morphing Potion for around 2,000 NP, flying all the way up to 300,000,000 NP for a Plushie Draik Morphing Potion.
See Transmogrification Potion also.
AvatarUse any Morphing potion on one of your pets and you will receive the Magical Kauvara Avatar.
Green Uni Project
Green Uni Project, or GUP, is a group of people who believe players should have to work to get the pets they want, and shouldn't be able to adopt painted pets. They take painted or limited edition pets from the pound and transform them into green unis using morphing potions. In response to this, there is now a group called Hush Guppies that retaliates by adopting green unis and transforming them into painted or LE pets. Both groups are old and not very active any more.
There are HUNDREDS of morphing potions - there are 54 blue morphing potions alone, yet only 1 invisible Morphing Potion! - so we won't list them here, but for the most part if a pet is available in a colour there will probably be a morphing potion for it.