If you are ordering from DTR, how about something like this? It's beautiful, and definitely an attention getter.
DTR's Laser Shop Sale of laser related parts like diodes - current limiting drivers - LED's - Fans - Laser collimating lenses Diodes 445nm XJ-M140 diodes 635nm Mitsubishi diodes 405 12X Blueray diodes Lenses Aixiz Three Element Glass Lens 405-G-2 405-G-1 Drivers Flexdrive V5 variable boost...
sites.google.com
Edit: If you just want a super looking wavelength, and aren't too interested in power or burning, the example below is my favorite choice.
DTR's Laser Shop Laser Related Parts Emporium. Diodes Laser Drivers Collimating Lenses 12mm, 20mm, 25mm and 35mm Copper Laser Diode Modules Diodes 450nm 7W NUBM44-V2(NUBM44-81/NUBM47-A1) 520nm 1W NDG7475 488nm 55mW GH04850B2G Lenses DTR-3E-R DTR-2E-G DTR-3E-B DTR-G-2 DTR-G-3 DTR-G-8...
sites.google.com