Ink pen
    Vinyl cutter
    Rotating tool like Dremel Proxxon Kressetc.

Vibrating tool (50/60Hz) dot peening www.overtoom.nl Record Power Ltd Sheffield England
10 watt 69 to 81 Eur o
Another Vibrating tool Brennenstuhl SignoGraph http://www.brennenstuhl.de/e_hgw1c_i.htm
25Watt 29 to 65 Eur o

Be very carefully with this tool => DO NOT show it to your girlfriend ;-)
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    How Things work => Inside the vibrator 220VAC 50Hz 10Watt

    Glue deposit
    Laser/water cut/mark
    Plasma torch
    Welding
    Pick&place
    Medical Lab
    Diamond drag engraving (scratching into material)

vinyl cutting  home made swivel http://www.cuttingedgecnc.com/cncmain.htm

etc.