In this paper, we demonstrate the use of state-of-the-art speech technology to transform speech from a source speaker to mimic a particular target speaker with the intention of providng personalized voices to users of Speech Generating Devices (SGDs). This speaker mimicry (SM) capability allows us to use high-quality acoustic inventories from professional speakers and transform them to a different target speaker using a very limited set of sentences from that speaker. This technology targets future SGD users who still have a limited vocabulary or available previous recordings. The results of a perceptual study show that listeners can identify which SM voices most resemble their respective target voices.