A few nice flash photo images I found:
Flower Drops
Image by fs999
Pentax K-7 • Tamron SP 90mm f:2.8 Di Macro
Dörr Combi TTL Macro Flash
Getting Closer
Image by fs999
Pentax K-7 • Pentax DA* 200mm f:2.8 ED SDM
Hoya Pro1 Digital Filter Close-Up N°3
Dörr Combi TTL Macro Flash
Handheld shot.