Momentary Alteration

Prerequisite(s): Exposure to alter self spell.
Benefit: Choose one specific form that you've turned yourself into with the alter self spell. Once per day, you can use alter self as a spell-like ability to turn yourself into this form for 1 minute.
Special: You can gain Momentary Alteration multiple times. Each time you take the feat, you can either extend the duration of an already chosen alternate form by 1 minute or choose another specific form from among those you've experienced after casting alter self on yourself.
Source: Unearthed Arcana