Here's my humble submission to your gallery.
a blue and white singlespeed mountain bike. This is based on the
first bike I ever bought with my own money, a 1998 Edinburgh Bicycle
Cooperative Contour 400 (www.edinburghbicycle.com).
forks are from On-One (www.on-one.co.uk).
Loads of bits (inc. the cheap and nasty front disc wheel) were recycled
bits from the Bike Station (www.thebikestation.org.uk)
The front disc is a Clarks one, and it works quite well, making
only occasional whining and gobbling noises. The rear wheel was
recycled from an old bike, and the single gear was fixed on using
a bunch of spacers and a decent cog from a couple of worn out cassettes.
The original rear mech is used to keep the chain nice and tensioned.
use this bike regularly to pull my son in his Chariot child trailer.
I even pulled him up hilly Arthur's Seat (Edinburgh's local extinct
volcano) for the Arthur's Seat Challenge (www.arthursseatchallenge.co.uk).
I don't do that sort of thing too often... Since this photo was
taken, the rear wheel has been renewed after the freewheel became
too free, and also a rack and mudguards have been botched on for
the sake of practicality and cleanliness. I've also upgraded the
gearing to 44x16 for extra sore leg muscles. Next thing to go on
is a set of dynamo lights, and maybe more gears depending on how
my legs cope as my son grows.