Just spotted this thread and I mainly ride fixed, so here is a selection of my fixed-gear bikes. All in daily use.
Late 70's Viscount. I got this from an old lady on Freecycle. It was wearing 5 gears and moustache handlebars when I got it and she was convinced it was junk. It was worn out but still useable. I re-built the wheels with new stainless spokes and a vintage flip-flop hub at the back, then steadily dressed it up with narrow alloy drop bars, drop-brakes with suicide levers, 1979 Brooks saddle and the quill pedals. I regret selling this one because it was a really nice smooth ride and had amazing aggressive geometry:
Late 70's Peugeot, the 'Yellow Peril'. This was given to me and was thought to be a Peugeot. Closer inspection of the lugwork identified it as a late 70's Pug which matched one of the lower-end models in the catalogue. I never got on with the steering geometry and the 40H rear wheel made finding a new chrome rim a nightmare, so I donated it to my girlfriend's brother instead of ploughing £££ into building a new set of wheels.
Late 70's Bob Jackson TT. I got the frame from Old Ned on here. When it arrived I was convinced it was going to be too small, but I mocked it up with some spare components and it turned out to be *just* ok. It's a small frame but the bottom bracket is very low so it was a lot bigger to sit on than it looked. I was aiming for that retro pursuit bike look. It's a joy to ride and this is my most-used bike at the moment:
Raleigh Twenty lookalike. This poor bike started life as a Universal shopper. I cut it up and turned it into a chopper and it went through various guises until I decided to put it back to an upright small-wheel shopper to live at work. I built the frame to fit me, so it's tall and short and great for getting round town on. It was single-speed in the photo but it's now got a 13T fixed gear at the back: