I have released the Julie Resynth (31 instruments) and Square Wave (26 instruments) expansion sets for Thumbjam. They sell for $2 and $1.49 respectively.

Both have free downloadable demos, visit this page for more info:
http://lesproductionszvon.com/for_iOS.htm

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I made 2 very simple preview videos of just browsing through some of the instruments:

http://www.youtube.com/watch?v=aj7MaTS8QUM

http://www.youtube.com/watch?v=5plVrUO1s64


These 2 sets are also available in other formats. Julie Resynth is available for BeatMaker 2 (iOS), Caustic 2 (Android/PlayBook/Win) and a larger version for computers in wav, soundfont, Kontakt 3 and Wusikstation formats.
http://lesproductionszvon.com/julie_resynth.htm

Square Wave is also available for Caustic 2 (Android/PlayBook/Win) and a larger version for computers, named MC3A in wav, sfz, and Kontakt 3 formats.
http://lesproductionszvon.com/MC3A.html