A simple python script that combines one adjective with one noun and adds a number between 1 and 99 to the end to generate random usernames. Possible number of distinct usernames is 850 million.
A sample of usernames generated :
ColorfulPod95
Big-HeartedPrefix36
PrivateThing58
PoisedStatute39
MoralWatch68
TragicShorts35
OtherParsley51
BlankFacelift45
WigglyDispatch46
ParallelGuestbook22
EquatorialPlough60
OrnateBaggage45
QuintessentialChicken88
SaltyCompany25
Jam-PackedIndustrialisation5
MammothGazelle62
FrightenedUnderwear96
DeafeningSurrounds9
IndelibleObi4
FrizzySoutheast92
HomelyRunaway8
UtterBeyond4
QuerulousExchange66
SeriousHornet61
PinkBed40
ShyFlexibility74
DefensiveMeringue73
SleepyDearest43
SoggySuck29
AttachedWatcher91
Well-OffBumper30
TornExcess12
GrayEngineering69
IdolizedOverclocking77
ShadowyLabourer12